Asterix games with co-op/PvP I could theoretically offer in Parsec.
I played Caesar's Challenge with Rubin before, it went well except Parsec captured my desktop as well due to the game's really low resolution (fullscreen in DOSBox refuses to work for whatever reason).
~~Yes, I tried playing Mega Madness with a flightstick, it's kinda masochistic but still possible.
I also have Asterix (1991) but it's difficult and the players take turns, I'd rather not.~~