Heroku is ending the free ride. Fair enough, although I wish I had seen this before I completed the sign up... little rude.
(In fairness, I remember reading about it, but then saw the free tier on the pricing page still.)
The point being, it would be nice if there was support for another low cost service which others might already be using. For example, JSON Schema is already using Cloudflare. Workers feels like it would probably be a nice solution, and can run on a cron.
While express.js isn't supported, there are a few alternative solutions: https://community.cloudflare.com/t/workers-with-nodejs/418291
I don't know off-hand if any other packages would cause a problem on the Workers platform.