Due to a temporary lower back issue, I found and purchased an Mbrace @ Chuck Levins here near D.C. Turns out the man who invented and holds the patent for this 'traption worked at Levins while developing it.
I had the store set it up with a fairly heavy Am Std Jazz on a tripod mic stand before I bought it. All www info I found and youtube shows the Mbrace holding light acoustics.
It is stable to stable plus holding my XB76. The photos show how it hangs from the standard strap positions. There are small rubber pads that hold the back of the bass off the plastic frame/plate and keep the body paint from contact. Once I get back to wearing the Bass, I can see still using this for recording having the Bass ready but not restricting me from moving from Keys to bass or PC (Unstrap, set on stand, pickup, re-strap, repeat.....oy)
Make sure you get a standard Mic stand with a threaded mount on 5/8" dia. tube, the Mbrace has the matching female thread insert installed. Check the pics.
