Need to use SSD with newer computer

Not sure if any of you have had dealings with Minisforum mini-computers. I’ve had a few over the past few years and a couple of them have had to be replaced. One thing I will say for them was they’ve always replaced them without problem and in both cases with better models.
But this last time they requested I remove all RAM and SSD drive which I did. On the SSD was a dual boot setup with Windows and Arch. I was worried that on receiving the new computer there might be some Windows licensing issue but Windows works fine. The problem was that on booting, no grub menu appears even though in the BIOS I disabled secure boot. In the BIOS in the boot options there was also no indication of a grub boot possibility.
When I first installed Arch next to Windows I had to do a lot of tweaking around this issue,

You may try this:

That is probably because you no longer have the EFI entries in the BIOS. You can boot off the ISO and re-add the entry with efibootmgr

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What is the best way to do this in EOS?