You can try a washer from a hardware store. That ego ring extend a bit to the outside in the top of the ring and and make a huge diference, you will not have a huge gap all the way in to the 510 conector. Your best bet will be a regular washer
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I've thought of using a washer, it'd be great if I could get a stainless washer of the same OD, I'll have to look around.
It's going to need to be quite thick too.

Currently it's the left one, I really wish it could be like the right one.
I'm pretty surprised nothing like it exists, the RSST looks like it was made for the SS VAMO, besides the gap at the bottom.