I think it is all well and good, but the most affordable option is probably still to buy a used MacBook with 16/32 or 64 GB (depending on the budget) unified memory and install Asahi Linux for tinkering.
Graphics cards with decent amount of memory are still massively overpriced (even used), big, noisy and draw a lot of energy.
Graphics cards with decent amount of memory are still massively overpriced (even used), big, noisy and draw a lot of energy.