Is it possible? Yes. Will it work? Maybe.
Maybe not.
Whether you have success or not, you might, eventually, find some peace in knowing you exhausted your ability to try. For you and your spouse, that might mean that you try with that last vial and then whether or not you wind up with a baby, you decide to close that chapter, knowing you tried. As you know, your greatest chance at success will be IVF with donor egg, followed by IVF with your own eggs, followed by IUI.
Good luck with your decision. I have two embryos in storage and while we feel 99% complete with one child I can’t bring myself to stop paying they fee each year. It’s hard.