I would understand the creativity of some cuban guy when he would try to reanimate his 1953 Buick with the engine from 1979 soviet made Lada.. It would be his only way to keep rolling.
But having around such a huge variety of new and used bikes I would not understand to-build-a-frankenstein approach. Unless you have some special feelings to this bike.
I would sell and would buy what you need. Little effort with most likely little money from your pocket.