You're making it sound as if these are scheduled doubleheaders like it's 1955. Doubleheaders nowadays are contingency measures for rain and COVID outbreaks. Owners make them single admission only grudgingly, usually if it's a weekday, and ticketholders can make their own decisions. So I'm not sure who I'm supposed to feel sorry for in your scenario. I'll tell you what, though: if I can only come to one of the games because of work (because again, if it's single admission it's probably a weekday), I'd like it to be an actual MLB-length game.
Maybe it's tin foil hattery to say this, but it's going to raise some eyebrows when in a tight pennant race the Mudville nine, a team blessed with a good rotation and a shaky bullpen, decide that the radar is iffy and it's better to call off tonight's game and play two games with different rules than what their competitors are playing, rules that directly play to their advantage.