You don’t need an LLM for this. You just need a FM that you fine tune, and you’d be surprised at how little computing power is actually required.
For our uses (which are similar to what OP wants), it takes longer for us to do an OCR scan on the documents our AI works with than for Sagemaker to do it’s thing on a rather small instance.
And, devs would just be implementing API calls, so it wouldn’t be a big deal to make the switch.