A couple of cheap alterative bowls I've found in EU
I use makeup brush holders like these ....er .... vape stands? :lol:
If you search Ebay and Amazon for silicone makeup brush holder there are some cheaper better ones in my opinion as they're lil softer.
Not sure if you've seen DDavemods mods for the EQ, I think you've almost described one of his MegAdapters.
I think his mods are worth the money altho there are loads of glass adapters you can use to do a similar job if you don't mind a bit of trial and error hunting them down and testing them...
Sorry, I'm in the UK so I dunno about US shipping.
For us, like many other retailers since the covid outbreak started, the only shipping option at the moment is what was the faster, more expensive, courier option before.