First of all, endgame is a bit of a silly word. Please don't kid yourself when you're using it (because most people who use that word are just kidding themselves). There is no 'endgame'. There are just different keyboards for different people- some people like cycling through endless variety, some people find something they like without too much hassle, and just stick with it.
Sounds like you might want an 1800 layout keyboard. That's got all the keys, and is a bit more compact. Choices are a bit more limited as TKL is much more popular.