Make a clone with look-alike rules.

Of course you'll need new maps, unit tokens, and scenarios custom to your clone.

I know it is easier said than done, but, rightsholders sit on obscure IP like a dragon on a hoard. If they DID make a new game based on this Squad Leader game, it probably wouldn't be the same game.

Quick edit from reading another post: If one just wants to play VASL looks like what one would want. Reimplementation of the rules in another engine, boom.