Mac+Premiere support for RX Vega 64?

I'm spec'ing out a new Mac Mini (to replace my ancient Mac Mini), on-which I'll be doing prosumer-level video editing. The Mini's stock GPU is trash, so I need to go with an external GPU.

Adobe's official/short list of officially-supported Mac Metal cards fall into two camps:

1. Old
2. Newer—but exclusively sold to Apple, not individual consumers (i.e., all the AMD Pro cards).

The obvious problem with #2 is that I can't buy one. What I can buy are the RX variants of those same cards. So, I called Adobe tech support and asked, "hey, will Mac Premiere work if I use an RX Vega 64?" He said no — I should only stick to their officially-supported GPUs.

So, I'd like a second opinion. Can anyone in this forum confirm whether an RX Vega 64 will or won't work?