mac – Can I get an eGPU without a thunderbolt 3?

I’m using a MacBook Air (early 2015) and trying to do some 3D rendering however it’s an absolute pain to do it on the cpu and it’s probably not good for the laptop to run at those temperatures for that long anyway.

I was thinking of getting an eGPU. The Apple website says that I need a MacBook with an intel processor and a thunderbolt 3 port. Mine doesn’t have the latter but I do think that USB to thunderbolt 3 adapters exist, would an eGPU still work if I were to use an adapter like that?