I’d like to set up my OSR device with a VESA mount for use in bed, but I’m struggling to find a suitable stand or bracket. Has anyone dealt with this before or have any recommendations? I’d really appreciate your advice. Thank you!
Has anyone else run into the same issue? 
no body
I havent got one, BUT it sounds like you need to find something that clamps to the bedframe and has an arm that you can attach the vesa mount to it. i only have a handy and made a solid desk mount using pvc pipes and a camera clamp 
I have contemplated different methods to make this possible and the conclusion i ended up with was to use one of those hospital tables that fit over the bed and use desk clamps (havnt bought it but thought about it lol). I thought about the setup you proposed and thought it was too difficult without fabricating a custom piece. I couldnt really find anything premade that would do the job but i also wasnt sure how to search for it either.
This has worked for me. OSR Market
Using an SR6 in Bed
Learn how to set up your SR6 device on a standard laptop stand for comfortable use in bed. (2.5m)
Stand used: Mount-It! Adjustable Laptop Stand
im using this - Amazon.com: BONTEC Dual Monitor Desk Mount, Full Motion Adjustable Monitor Stand for 13–27 Inch Screens, Heavy Duty Arms Hold Up to 22 lbs Each, VESA 75x75/100x100 mm, C Clamp and Grommet Base, Cable Management : Electronics monitor arm mount. I connected both arms together to get the length I need. Clamped to a table next to my bed, it works pretty good overall, tho a osr/sr6 can generate a lot of force and rock the table quite a bit. Im able to leave everything set up so i just swing it out of the way when not needed. Its not 100% perfect but gets the job done.