OK so I went ahead and did it anyway - I hope another topic is acceptable to the forum admins.
Removed drive from AMD platform machine, installed into Intel Haswell platform machine WITH uefi BIOS. Waited a while, it booted, got devices ready and boom ! there was the desktop. The only intervention required from me was to replace the standard MS video card driver with the 'proper' one. Job done, works beautifully.
