I found this code on an archived /v/ E.Y.E. Divine Cybermancy thread, and I figured I should do some tweaking and share it here. I added new a weapon category (4 for Katana/Damocles + BK13/BK 444 combination, for example) and also binds for medikit and grenades, respectively.

Link to archived thread here.[4chanarchives.com]

• First, go to your settings and unbind ALL your Weapon Category (1-6 at least) binds in-game like so (except for Next Weapon and Last weapon used controls, I binded them to something else, you don't have to leave them empty or change them):
  
  
• After that, navigate to your E.Y.E. Divine Cybermancy config folder. (Default is Steam/steamapps/EYE/EYE/cfg)
  
• Backup everything just in case!
  
• Open config.cfg with Notepad or Notepad++ (latter is preferable since it declutters everything)
  
• Under unbindall, input the following and save:
  
  bind "1" "meleeweapon"
  bind "2" "primaryweapon"
  bind "3" "secondaryweapon"
  bind "4" "dualwield"
  bind "5" "medic"
  bind "6" "grenade"
  
  
• Next, open your extended.cfg using the same method.
  
• Input the following into your extended.cfg:
  
  //New itemhotkeys
  //primary weapons (heavy, rifles, assault rifles, shotguns)
  alias primaryweapon primary1
  alias primary1 "use weapon_spiculum; use weapon_sulfatum; use weapon_excidium; use weapon_s6000; use weapon_rotten; use weapon_fko_ka93; use weapon_hunting; use weapon_trk; use weapon_bosco; use weapon_caw_hammer; use weapon_depezador"
  
  
  //secondary weapons (smgs, pistols, bettyboom)
  alias secondaryweapon secondary0
  alias secondary0 "use weapon_dual_bk13; use weapon_fko_black; use weapon_betty_boom; use weapon_gctg222; use weapon_croon_hs; use weapon_motra; use weapon_bk444; alias secondaryweapon secondary1" //secondary submachine weapons
  alias secondary1 "use weapon_bk444; use weapon_motra; use weapon_croon_hs; use weapon_betty_boom; use weapon_gctg222; use weapon_fko_black; use weapon_dual_bk13; alias secondaryweapon secondary0"
  
  
  //melee weapons
  alias meleeweapon melee0
  alias melee0 "use weapon_sinkatana; use weapon_dual_katana; use weapon_damocles; use weapon_arrancadora; alias meleeweapon melee1" //melee weapons
  alias melee1 "use weapon_sinkatana; use weapon_arrancadora; use weapon_damocles; use weapon_dual_katana; alias meleeweapon melee0"
  
  //handgun + melee
  alias dualwield dual0
  alias dual0 "use weapon_BK13_katana; use weapon_BK13_damocles; use weapon_BK444_katana; alias dualwield dual0" //BK13 priority
  //alias dual1 "use weapon_BK444_katana; weapon_BK13_katana; use weapon_BK13_damocles; alias dualwield dual1" //BK444 priority
  
  //grenade
  alias grenade gr0
  alias gr0 "use weapon_kinder; alias grenade gr0"
  
  //medikit
  alias medic med0
  alias med0 "use weapon_medkit; alias medic med0"
  
  
• Save the file.
  
• Create an autoexec.cfg file and then put in the following:
  
  exec extended.cfg
  
  
• Done, you're all set! Try it out in-game

• 1 is binded for Melee Weapons
  
• 2 is binded for Rifles/Shotguns/Heavy Weapons
  
• 3 is binded for Pistols/SMGs/Betty Boom
  
• 4 is binded for Sword + Gun combination (Katana/Damocles + BK13/BK444)
  
• 5 is binded for Medikit
  
• 6 is binded for Grenades
  
  NOTE: You can carry up to 2 Weapons for each category, and cycle through them by pressing their respective keybindings.
  
  ISSUES
  
  • You can only carry one melee weapon, and it also replaces the default Katana (the Facere Mortis), meaning you won't be able to select it as long as you have another one in your inventory. You also can't cycle through them if you have two melee weapons equipped, and you'll just end up selecting the most recent melee weapon you put in. (i.e Having the Damocles and the Dual Katanas at the same time.)
    
  • If you carry more than 2 weapons from a weapon category, (i.e Having the BK13, GCTG 222k, and Black Crow at the same time) you will only be able select only the two of most recently applied weapons.
    
  • Dual-Wield category is finnicky; if you have the Dual Katanas, BK13, and the BK444, you'll only be able to combine one of them, and won't be able to select or cycle to the other one, and will usually select the most recent one you put in your inventory. (i.e. Having the BK13 and Dual-Katanas in your inventory, and then putting in the BK444; once you switch to Dual-Wield, it will select BK444 instead and won't let you cycle to BK13.)
    
  • If you change a controls or keybinds in-game, it'll erase the weapon keybinds and you'll have to apply and do the process all over again.
    
  • If you press a keybind too fast, you might end up causing your weapon to disappear.
    
  • Hasn't been play-tested extensively, so weapon selection regarding these keybinds will have new bugs around in general.
    
  • Your legs won't be OK.
    
    Also, distrust your mentor, and obey your commander!