I don't know if anyone is following this thread but I have rehomed the discus. The guy I found doesn't have any discus but has a 75 gallon tank of RO water with German blue Rams.
That's brilliant, well done you! It's not nice to have to rehome a fish, but it's the right thing to do sometimes.
That's a good size tank for him, and discus and rams need exactly the same kind of water, so he should do well