I spent a few days thinking whether I should upgrade an SFF PC I use as a server, or buy a mini/tiny. The problem in the end boiled down to a decision between a tiny with an AMD APU, or adding an NVIDIA to the SFF. Sadly support for APU/NPU on Linux is still very unclear/uncertain right now, and I lack the time and skills to contribute to the development. So, let's go with a used NVIDIA for now.
(For now... I'm sure I'm gonna regret it soon.)