i think PEG400 would work excellent. most of these expensive products like wax liquidizor and the potion or the secret or whatever are just mixtures of PEG400, PEG200(or300?) and PG at varying levels and i've heard positive reviews about them. i heard people having success mixing shatter with pure PG also, that's why i was hoping if i added 2x the amount of 50/50 PG/VG it would work lol but i guess not, i'm clearly not a chemist either.
going to pack this in my tank and see if i get a good taste or buzz, haven't smoked any flower in 3 days so i'll get a buzz pretty easily if i dont get nicotine poisoning first
edit: oh yeah it tastes like shatter and i got a buzz going already LOL i maybe i just reached the max solubility