Should I hedge this "bet"? What is the highest EV move?

[DrJ]

I've sold a pair of tickets to a game, but it is contingent upon another game.

If Team A wins, tickets are good, sale goes through, yadda yadda. If Team B wins, game doesn't happen, money has to be refunded.

Team A will be favored in the contest. Since Team B is yet to be determined, the spread is unknown.

Which offers higher EV:

1) Keeping my straight bet on Team A, who will be favored?

2) Hedging my bet, by betting half of the amount on Team B. Guaranteeing 50% of my money in most circumstances, but with a slight possibility of getting 150%?

Is #2 a higher EV no matter what the spread is? How much does the EV change as the spread increases?