Thank you for the suggestion, I think this is a pretty important feature to add so I will explore at least getting a window mode up and running in the interim so you can click and drag it to your main monitor.
I'm less confident when it comes as HOTAS matters as Unity does not have any support for them at all, so it will be a bit tough working on them. Better to disconnect all peripherals for the time being apart from KBM and controller.

