I was actually trying to point out that the tank was 4-foot for the eel, not based on your 75 gallon comment but I guess it works for both.

I just don't think that a 4 foot tank would be great for a tire track eel... There are other smaller spiny eels though if eels appeal to the OP.
I don't know enough about BGKs to know if they would eat Rams? I would think possibly once they got larger. Rams aren't all that big. You'd want a big group of them in a tank that size I'd think. If you had a lot of plants they'd be fine, and they're interactive for a dwarf. I like the Bolivians over the German Blues - more hardy, a little larger, and generally more OK with others. If the BGK won't eat the dwarf cichlids you could do a few different types of them (Apistos, checkerboards) in a planted tank.
Not sure kissing gouramis would work - check out Seriously Fish's info on them.
http://www.seriouslyfish.com/species/helostoma-temminkii/
There are lots of other gouramis that would work though.
I do like the idea of upper jaw bichirs, but I'm a poly lover.
Other cichlids that might work (others may chip in for more options)
Geos, Rainbows, Festivums, Keyholes, Severum