Sorry for the late reply.
Brotherhood of Shadow - Solomons Revenge: I'd say it is very unlikely at the moment, I would have to look into this at a later date. The reason why I think this might not work is because I already use texture files from this mod in K1GI meaning you'll find K1GI Republic Jedi Robes and BOSSR Republic Jedi Robes, the same item but with different stats. Plus, some NPCs have been used as well such as the Republic Commando who appears once in BOSSR but appears multiple times across the vanilla galaxy in K1GI.
K1 Community Patch: I wouldn't suspect this would break anything but it 'may' undo a few things in terms of NPCs etc and maybe dialogue. At some point past the Demo stage, I will try and implement as many "Patches" from here as possible.
K1 Force Pack V1.0: I suspect that would work 100% fine, in fact, parts of this could be integrated in the future as the mod author states in his readme that he doesn't mind it being used as long as its credited.
Party Leveler K1: If it uses a TSLPatcher I suspect it is possible that this mod will work flawlessly, if it doesn't work flawlessly I can create a Party Leveler K1GI version as an optional installation.
I'm glad you've enjoyed the mod thus far.
No, mainly because that mod is almost 10 GB in size. Plus, even with that mod installed you'll have vanilla textures in HD with modded textures in the standard resolution (Think about the new Jedi Robe items and alien skins for example)