As a final followup, Nintendo finally released Advance Wars 1 & 2 Reboot Camp for the Nintendo Switch on April 21, 2023.
It's... OK.
If you've never played the game before, you'll probably like the reboot, and at present it is by far the cheapest way to buy and play the game.
I prefer playing the original games on emulation on my G Cloud to playing the Switch version. The music on the new game sounds like they put it through a loudness filter, to its detriment. The graphics on the new game are good, but the graphics on the original are more iconic. I find it harder to tell some of the units apart on the new version, particularly the Medium Tank and the Regular Tank. I also can't read a map on the new game as instantly as I can on the original.
The remake hits me like a bad photocopy of the original.