I’ve marked the below answer as the solution to your question as it is by far the best answer you’ll get.
However, if you disagree with my choice, please feel free to take any other answer as the solution to your question or even remove the solution altogether: You are in control! (I just want to avoid even more subjective opinions being posted and confusing you even more)
P.S. In the future, please mark a solution like this:
so that the next person that has the exact same problem you just had will benefit from your post as well as your question will now be in the “solved” status.
There is 1 possible “gotcha”, be aware
If you are going to use the SD as a recovery, you will have identical labels,
this is not good (sudo blkid, lsblk)
So, change one (emmc or SD), make self documenting (old-label-SD or -emmc)
e2label, dosfslabel, and change fstab and extlinux too
dosfslabel has 11 char limit