
I think Komodo Simulations have some interesting collective controls.
When it comes to ergonomics, some essential factors have to be considered and I think VKB is on point and more than able to avoid the X55/X65 weaknesses. I own a X55 and despite the cheap build quality and (numerous) flaws (the rotaries resolution is awful and jumpy!), it's a very decent throttle, full of buttons, switches and such. Everything you need for a modern sim.
I'd be delighted to discover VKB is considering a Su-35/X55 dual throttle. Even the weirdo-potato F-35 throttle looks really interesting (I'd like to test it, if you happen to know a F-35 reseller around).
But perhaps the WWII era controls have to be complete first? (but the Black Mamba design was there first, right?)