Care to give some pointers on what to look at? Looks like I will be doing something similar soon so that would be much appreciated

Just ask chat gpt about state of the art in context pruning and other methods to optimize the context being provided to a LLM, it's a good research helper. The right mental model is that it's basically like RAG in reverse, instead of trying to select and rank from a data set, you're trying to select and rank from context given a budget.