I'd be more likely to troll the hardcore fans by making GregTech et al as easy as humanly possible...using MineTweaker, if necessary.
Besides, those last two don't really seem to fit the theme: they (going by titles alone) seem more geared toward mobs and such, not decoration. I would, however, spend all the time needed to port XyCraft to 1.6. Only the aesthetic blocks and nothing else. In fact, if I could, I'd make a meta mod that removes all block tile entities, rendering them utterly useless for anything other than decoration. Everything from MFSUs to extractors to force field projectors to chests, furnaces, and combustion engines. You will all become part of the decor singularity. Resistance is useless. JOIN US AND LIVE.