The general rule in terms of office/computer setup is that your wrist should be pretty much flat/level to the angle the keyboard and mouse would be at. Thats a weird way of saying your wrist should be straight
Thats H&S stuff to protect themselves from complaints from extended use at an uncomfortable etc, but the reasoning is relevant to what you're asking about.
Im lucky that my setup i can actually have the HOTAS mounted just under the keyboard tray, so i can slide the tray over and it sits about 5mm above the base of the stick, so the stick & throttle are at a decent height.
The most likely seems like it'd be to clamp or attach a 'shelf' which sits under the tabletop, so it can be say 3" lower and can be spun round so that it doesnt stick out when its not in use. It'd require minimal construction or expense, and if done with some thought, could probably be done without feeling like you're hacking something up to do it, it could be removed and not look any different to now.
Have a google round for things like 'HOTAS Mounts' and i bet you'll find a solution you think would fit your needs. Stuff like Halfmad just pointed to, there should be plenty of it.

Thats H&S stuff to protect themselves from complaints from extended use at an uncomfortable etc, but the reasoning is relevant to what you're asking about.
Im lucky that my setup i can actually have the HOTAS mounted just under the keyboard tray, so i can slide the tray over and it sits about 5mm above the base of the stick, so the stick & throttle are at a decent height.
The most likely seems like it'd be to clamp or attach a 'shelf' which sits under the tabletop, so it can be say 3" lower and can be spun round so that it doesnt stick out when its not in use. It'd require minimal construction or expense, and if done with some thought, could probably be done without feeling like you're hacking something up to do it, it could be removed and not look any different to now.
Have a google round for things like 'HOTAS Mounts' and i bet you'll find a solution you think would fit your needs. Stuff like Halfmad just pointed to, there should be plenty of it.