[Ee Keeper] Easy way to add incompatible weapon type to kit?

I hope my subject line wasn't confusing.
Simply what I want to do is take the thief class, Bounty Hunter, and allow it to use Heavy Crossbows to make it a ranged trapper class.
If this is too hard I may settle for light crossbows, or take an archer and give it some thief trapping proficiency and the snares. But if this is something easy I'd rather stick with thief.
My first post so I hope I'm not violating any rules please be gentle.
Simply what I want to do is take the thief class, Bounty Hunter, and allow it to use Heavy Crossbows to make it a ranged trapper class.
If this is too hard I may settle for light crossbows, or take an archer and give it some thief trapping proficiency and the snares. But if this is something easy I'd rather stick with thief.
My first post so I hope I'm not violating any rules please be gentle.
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Comments
In order to make heavy crossbows usable by Bounty Hunters (but not other thieves) ... this framework isn't sufficient. We could edit all the heavy crossbows to make them usable by thieves and unusable by swashbucklers, assassins, or shadowdancers, but that still leaves vanilla thieves.
In fact, I don't know if I could do it at all.
So, then ... you know, nearly all of the good crossbows are light crossbows. Not getting the heavy kind doesn't really hurt in gameplay.
Archer, add some points into set traps to make it useable and add the snares via ee keeper.
Fighter / Thief, dump points into set traps, add special set snare via ee keeper if desired.