If you have a USB with Sergei Strelec, for example, you COULD plug the hdd into the legacy machine and try to "cast a spell" on it to make it boot into Legacy mode, but personally I haven't had success with that.
Does macrium recognize the windows partition? If yes, create a backup of that partition only and on the legacy system use the deploy on other hardware and see what happens. Macrium can be found on almost all winpe(se) ISOs, including the one from strelec.
Try with duet (it works) but Clover is even better. I use it personally to boot an NVME SSD on an old Server that doesn't come with NVME support. (it was created as helper to boot MACOS X, that needs UEFI since the beginning, on BIOS only machines but it works for other UEFI OSes as well)