A little frame challenge - your DM probably should allow you to roll a chance to use Wish.
Per your comment:
we didn't fail our saves but rather our DM gave us three flat uses of wish, and we weren't expecting to play these characters again. For plot reasons however we are doing a one shot that does require them though
3 flat uses are decent deal for one-shot characters, but not so great for recurring ones, so when you agreed to that, you didn't have information to make an informed decision. In other words, your player's agency was limited.
If your characters have never cast Wish in stress inducing manner, they should by all means be able to do it again. Even if some uses was stressful, each character's chance to still be able to cast it is, depending on number of stress inducing uses:
- 67%2 ≈ 45%
- 67%3 ≈ 30%
I strongly recommend you to ask your DM to allow you to roll that probability. That way you will be back to normal rules, and in worst case scenario you both used wish in stress inducing manner 3 times, you still have a 64% chance that at least one of you will be able to cast it again.