I beleve it will form a solid, just not crystaline...more gooey like you said. you wouldnt have to filter, if it formed a solid wouldnt it sink to the bottom? If so you could decant or pipet off the NP then collect with basified h20.
My swim feels very comfortable gassing hcl as he has done it numerous times to precipitate mescaline hcl, thus he knows the risk hazards.
just a theory thats been itching my head lately....thanks for your opinion