Model loading is all client-side. Stuff you mentioned (later models that overwrite earlier models) are mostly controlled through the client's Resources/GlobalLoad.txt file; just removing lines from that file may be enough for what you want.
For example: luclin global pet models (beastlord pets + luclin skeletons, basically) are in Global6_chr, removing the line in GlobalLoad.txt for Global6_chr might be enough to get old skeletons working (GlobalSKE_chr2 also sounds suspicious, haven't looked at that one though).
Weapon models are loaded from files like loyequip, gatesequip, donequip.eqg, etc. I don't remember which expansion overwrote some of the really early weapon models, but you can probably get rid of all the ___equip lines. Make sure to keep the GEquip ones though, those are where the original models are loaded from.
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