I would say it is so simple to DIY as well.
For FS bar, one would only need a simple piece of ie aluminium (plastic?) shaped as a hook under the quick release depower lines. This can be added in no time with removing the lines. If you think about that, the plastic might actually slide over the 'oval' stainless steel QR end, and with a few holes, the lines can go through.
Than, because the FS bar has automatic untwisting of depower lines, the hook would be in exactly the same place after you untwist. Every time, all the time.
On the bar itself, a loop is needed as discussed before.
Damn, I'll build this
Wish for a free time tho....