This is what services like Vast.ai are for - super cheap GPUs you just use as long as you need etc etc.
I wouldn't put anything confidential through it.
It turns out that I can run most of the appropriate models on my ancient laptop if I don't mind waiting for the complicated ones to finish. If I do mind, I can just send that part to OpenAI or similar. If your workflow can scale horizontally like my OCR pipeline crap, every box in your shop with RAM >= 16GB might be useful.
Apologies if this is all stuff you're familiar with.