I don't think there was ever an option to 'save the AES'... it is exactly what it was marketed as. The true arcade machine at home. It was designed for an extremely limited audience. Big fat carts that far exceed the Genesis/ MD and the SNES with no compromises.
It was mostly a mail-order item through various gaming magazines. You had to look through the back pages of most gaming magazines for Chips&Bits, Die Hard Gamers Club, TOMO, GameDude, or contact SNK directly and order one of these machines and games wholesale. Not many retail outlets even stocked the AES. Game carts literally cost up to $250.00 for the later KOF's and Metal Slugs.
The budget model of the Neo-Geo was the Neo-Geo CD and CDx units, and those did cut the costs of games down to $50.00 to $60.00 and probably were the best bet for selling games at a more affordable prices. The Neo-Geo CD has roughly 7MB of RAM all in, and even this unit struggled to run MVS games 1:1 with the AES, as some CD games did have missing frames of animation and background layers. But came really close.
The other option was for SNK to port these games out to the Saturn, PS1, Dreamcast, PS2, GCN era platforms. Most of the Saturn ports were left behind in Japan due to SOA not seeing 2D games as profitable. Also the 1-4MB RAM carts were left behind in Japan. The Playstation did get a few ports come to the Western markets. But these ports were lacking in many ways. PS2 and the Cube had a few SNK collections.