Got a weird one here.

I was trying to do some DIY painting at church...attempting to do everything right.
Sanded and Sponged down the latex-covered walls with TSP. Wiped off with a clean wet towel and let air dry.
As I was finishing the first coat of latex primer, I looked over to notice the paint starting to bubble.
I realized that someone had painted latex paint over oil based without priming (and probably without sanding or other prep.)

Question: There are about 2500 square feet of wall like this that I need to paint on a very small budget (though the paint is good quality).

Is there a solution that does not include taking off the old latex? there a different type of primer I can use to make this work?