Well, you pretty much mentioned all the bars around .. except for Dominos, which is what Tuller is working on now .. Same as Bartender, tho .. 10 bars limit. Anyhow, even though Bongos isn't updated, it's still working and might be working for a long time, I don't see a reason not to keep using it. If that doesn't fit you, I would try to get Trinity working. I assume you mean Trinity 2 and not 3 - if not I am unaware of a version 3 ;-).

Try delete your Trinity folder, and the it's SavedVariables ..

(wow -> wtf -> account -> (accountname) -> savedvariables -> trinity files)

and since I am not a trinity user myself (I stick with Dominos), I am unaware of possible character specific options, if so, you'd also have to go to .. and delete those.

(wow -> wtf -> account -> (accountname) -> (servername) -> (character(s)) -> savedvariables -> trinity files)

From there you'd have to start all over, all settings should be default and hopefully you won't have the keybinding problem. This might not work at all and could therefore be another addon interacting with Trinity. I would then suggest you to write a comment on wowinterface -> trinity 2, explaining your problem. People tend to find fast solutions