Rohos a great option.
I know some people are having success with the ACR1252u.
My quick and dirty alternative, is an off the shelf suggestion (but no memory like you are wanting)
an HF and LF reader in one like this
You could change the LF side of your NExT whenever a change needs to happen.
and or you can add a prefix and or suffix you manually type.
Another one, that I really like and I have built a couple of my own (i need to do a write up)
Super clever design and usability.
That should serve your purpose perfectly
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