Is there an "at"-like cron alternative?

This is probably a stupid question, and I know the common answer will be something along the lines of "just learn cron", but it seems like there's a huge gulf between the simplicity and elegance of the way the "at" command works and the bulky, industrial quality of "cron". I just want to be able to type in something like:

at 3:00 PM weekdays until 2020-05-01

and then dump a recurring job onto my atq. I particularly don't feel like screwing around setting up the execution environment/path etc. of cron: I just want my user, with my usual shell environment, to run a potentially recurring command. I also plan on changing this schedule frequently, disabling it, etc.

If it helps, the use case is to run predictive models that need a lot of babysitting: I can let them run by themselves for a few days, but then something changes in the external environment which requires me to modify the models, or I get a request for a new output feature and they need to be tweaked, or a new data source becomes available, and I don't have time to build a more robustly engineered solution.