Yeah, HOTAS is the way. I got mine mounted in front of, and in line with the armrests with vesa tube mounting brackets on an ikea chair… Let me have a look if I have some old pictures on this computer…
edit: I actually took the mounts to a store to test if you could mount them on a Playseat Challenge and it’s doable if you want a simple portable combo rig.
I’ve found them, repeat, I’ve found them:
5K+ with Vive Pro headstrap, not the Pimax carbonite copy. This was in 2018.