@Danlopez1222 about the idea of CPU-microcode/-support transplantation:
I think we are a step further to be able to achieve that. There is a product announced: "DeskMini Max" which is 5000-Series based
mainboard with PCIe 16x slot. Therefore, we could probably grab it's BIOS/UEFI and do some surgery on it combined with A300 UEFI
DeskMini Max is using *no* dedicated chipset. Still running on knoll-based-config.
It seems from the video (they're opening up the case, so you can see the mainboard) they've updated the power-stages on the mainboard being
4+1+1 (I guess '4' to be able to satisfy 105Watt against 65W using '3' VRMs)
ASRock DeskMini Max is a bigger small PC with support for Ryzen 5000 and discrete graphics
liliputing.com
www.asrock.com
This platform seems to be indeed the A300 v2.0 because of the PSU, but also TDP being up to 105 Watt it seems they've updated the VRMs and
power-rails for the CPU/SoC/APU - there is residing my hope of "true" o/c being actually feasible. There is only one M.2 slot for NVMe's though and 2x S-ATA.
And being 10L in volume, it remains a question weather a standard mITX/ITX-platform would be actually the "way-to-go"-platform, since 10L is not small factor
anymore - when comparing against 1.92L from the A300. I think the price will be the point, on which a customer can decide.
PSU + Case + Mainboard (B550-based) => ~300€
Deskmini Max therefore should be <300€
And again, you can re-buy the RAM -.-, since Max is using U-DIMMs. Not pleased by this fact.