I have a VKB with 200 mm extension mounted with a MonsterTech. I think you saw my pictures in another thread. The vertical design is no problem when attached to the bottom cross beam. However, I am not using the hotas center plate as my solution interfere with the attachment of that.
I have been thinking of another way to attach the stick to make it possible using the center plate and also make getting in and out of the rig easier.
I think it will be possible using the bottom part of the supplied stick mount, if mounting it horizontally instead of vertically. You will just need to attach a diy plate with correct thickness to the square bar.
I haven't tried this myself yet, still in the planning phase, it's just an idea if you want to try it.