Sorry it should have occurred to me that you’d already considered this.
I am so tempted by this just to futureproof myself against Catalina and no more Nvidia support from Apple. My hatred for the T2 chip architecture is already well documented upthread. Basically I’m in the same boat as Chris, but I’m more attached to CUDA support as working occasionally with tensorflow.
The only issue is my current GPU (running off a 2013 MacBook Pro) is watercooled and I don’t think there’s space for the additional fan in this case, right? It’s currently housed in an eGPU case but that needs thunderbolt, which the G5 doesn’t support. So I’d have to buy another GPU unless anyone has any suggestions. If I can overcome the GPU challenge I’ll take it.