MS5607 temp/pressure sensor

I’m very sorry to bother anyone. Although I do have a Particle, I’m trying to use a MS5607 with a different processor. I certainly realize that I probably shouldn’t post here, but I am at wits end.

All the MS5607 code snippets assume 64 bit math. But I’m using a different processor/compiler that has only 32 bit signed arithmetic - and NO partial product can exceed that length. I’m willing to throw away a bit of accuracy, but I was wondering if anyone was willing to help me figure out a way to make this work.