An ex colleague is working on Headroom, a much more legit alternative to RTK. They provide accuracy benchmarks in the repo and are transparent about the compression algorithms used for the different output types. I liked their approach a lot better than RTK and thought it might be relevant for you.
This thread is gold, looks like setting up a combination of both tools could reduce token consumption by 50% essentially doubling the subscription? Will be testing this out after morning coffee for sure
https://github.com/chopratejas/headroom