Hey hardwaresofton, this is exactly what we're planning to do on https://srv.io/ :)
The platform is mostly ready, and we're just finishing some infrastructure changes to allow the platform to run third-party applications safely. We are planning to include Listmonk in a second batch of the applications to release.
I personally enjoy working with Listmonk, it has replaced Sendy[0] for me.
[0]: https://sendy.co/