WELCOME! to the forum.!
I would skip the smartcard reader for the old machine and put the money toward a mew fully data-capable machine.
Supplier #2 here on the board sells gently used or open-box machinesfor great prices from what I have read.
You could always keep the S8 for a backup since it is still running. and if your ship ever comes in, you could get the cardreader for it, (Ha-Ha.)
Good luck to you on your decision.