I don’t think so I figure when Operation 5 does launch you’ll be able to unlock Gabe through regular means or have to wait a a bit.
But just playing the tutorial on any platform(mobile or P.C.) should give you the unlock (assuming T.C. doesn’t ■■■■ something up) so as long as you do that or have done it already you should be able to just cancel the Subscription.
If doing it now doesn’t register the unlock for later just use a free subscription and play Tactics til up to the tutorial when it releases and you’ll just get it anyway.

