you can't, the weapons need to be made with c_hands in the first place
since this weapon pack was initially released 8+ years ago without c_hands support, i doubt you'll find any weapons with c_hands

if you read change notes you'll find i added c_hadns support only for 2 weapons in an old gamemode i made which uses cw 2.0, past that i don't really care since i don't get paid for gmod ♥♥♥♥