If you don’t have an old Android phone that you can dedicate to this, an Android emulator for Linux should work to run a Tasker/SmatHome app instance, but I’ve never tried that. Many to choose from - Andro, Genymotion…
See this post for Tasker configuration to call Home Assistant services. There is also a Home Assistant plugin for Tasker that is optional, and might simplify the config a bit.