I went with the Suzi Tank Ring. It IS the EVO and purchased the SWbag that you posted. (My KTM (1290 SAS) branded bag is also a SW EVO and it fits.)The tank ring is available now on the suzuki accessories page, and I have one on the way.
Ring Mount (2022)
It works with the Suzuki branded SW Motech Evo City bag, which I like and have ordered, but it's back-ordered, and no longer available on the Suzuki site. You MIGHT be able to have your dealer order one on backorder, don't know.
View attachment 1651856
SW Motech DOES HAVE a US based website, and you should really use it. I messed around for way too long on the German site without any suggestion that I switch to the better option. But it's WAY better. This ring and setup works with the EVO line, but I think they're phasing it out for a newer ring design and line which doesn't have a Gen 3 busa base yet, but I could be out of date. But here's the same bag from SW Motech, for the same price. (I also liked their tank protectors, and got a set though they might be too wide):
View attachment 1651857
These do have a string to unlock them from the tank, but under 'accessories' there's a pin lock system where you drill a small hole in the bottom of the bag, push a pin through, and it keeps the ring locked regardless of the cable. It also has a small combo lock for the zippers. I bought one of those locks as well. This is the US site:
EVO City tank bag
Anti-theft protection for PRO/ EVO tank bag
Tankpad. 79,6 x 113 mm. Black/Grey
Yes, SW is moving from EVO to PRO.