I think I have a way so if he destroys you in the present, then you can still be alive, as long as his troops leave. You build portable main base (in outpost terms, a convec with a CC in it) and have a time machine in your base. He destroys your base in the present. You go back in time and find where you had the Convec and send him into the present, with the enemy troops gone, you rebuild your base again, he will think theres no one in that area since you just got killed. Idk if you can timewarp units if in the present there is no time machine.