Required mods
For this loadout you need two weapon mods, Primary Grenade Launcher and Ballistic Shields:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1673431726
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1416242202

Configs
1) First things first, ballistic shields only work with certain primary weapons and we have to make sure both weapons can be equipped together. Create XComShields.ini and include the following:

[WotCBallisticShields.X2DataStructure_BallisticShields]
+AllowedPrimaryWeaponCategoriesWithShield=grenade_launcher

2) Light Ordnance is added to the grenade launcher with a config file, which means we can revert it the same way. Create XComMZPrimaryLauncher.ini and include the following:

[PrimaryGrenadeLauncher.X2Item_MZPrimaryLauncher]
-MICROLAUNCHER_PERKS=PrimaryLightOrdnance

3) Both primary grenade launchers and ballistic shields rely on squad upgrades for their advanced versions, which do not exist in LWotC. To be able to build upgraded shields and launchers add this to your XComLW_Overhaul.ini :

[LW_Overhaul.LWTemplateMods]
+ItemTable=(ItemTemplateName="MicroGrenadeLauncher_CV", Slots=1,Starting=true, Infinite=true, Buildable=false)
+ItemTable=(ItemTemplateName="MicroGrenadeLauncher_MG",Slots=0, Starting=false, Infinite=false, Buildable=true, RequiredTech1="MagnetizedWeapons", RequiredTech2="", SupplyCost=25, AlloyCost=1, CrystalCost=1, CoreCost=0, SpecialItemTemplateName="", SpecialItemCost=0, TradingPostValue=20, RequiredEngineeringScore=25, Tier = 107, PointsToComplete=200)
+ItemTable=(ItemTemplateName="MicroGrenadeLauncher_BM",Slots=0, Starting=false, Infinite=false, Buildable=true, RequiredTech1="PlasmaRifle", RequiredTech2="WARSuit", SupplyCost=100, AlloyCost=5, CrystalCost=10, CoreCost=1, SpecialItemTemplateName="", SpecialItemCost=0, TradingPostValue=50, RequiredEngineeringScore=40, Tier = 108, PointsToComplete=200)

+ItemTable=(ItemTemplateName="BallisticShield_CV", Slots=1,Starting=true, Infinite=true, Buildable=false)
+ItemTable=(ItemTemplateName="BallisticShield_MG", Slots=2, Starting=false, Infinite=false, Buildable=true, RequiredTech1="PlatedArmor", RequiredTech2="", SupplyCost=20, AlloyCost=3, CrystalCost=0, CoreCost=0, SpecialItemTemplateName="", SpecialItemCost=0, TradingPostValue=10, RequiredEngineeringScore=20, Tier = 160, PointsToComplete=150)
+ItemTable=(ItemTemplateName="BallisticShield_BM", Slots=3, Starting=false, Infinite=false, Buildable=true, RequiredTech1="PoweredArmor", RequiredTech2="", SupplyCost=40, AlloyCost=5, CrystalCost=5, CoreCost=0, SpecialItemTemplateName="", SpecialItemCost=0, TradingPostValue=20, RequiredEngineeringScore=35, Tier = 180, PointsToComplete=150)

Note: Entries for shields come from Mod Jam, while entries for launchers are copied from LWotC with changes from secondary grenade launchers to primary ones.

4) And finally, this is to give shields infiltration times. Create XComLW_InfiltrationSettings.ini and include the following:

[LW_Overhaul.XComGameState_LWPersistentSquad]

+WeaponCategoryCovertness=(CategoryName="shield", CovertnessValue=225f, CovertnessWeight=0.5f)

Again, this comes from Mod Jam. Since both primary and secondary launchers seem to fall under the "grenade_launcher" category they should be covered by LWotC's infiltration values.