Yes the Sonoff 4CHPro has been in the cupboard for a while, and so I thought that 1 year of procrastination was just about enough.
I used the Scheduler-Card via the HACS store to provide a slightly nicer interface for managing the timers.
I ended up doing a lot of messing around with helpers and timers etc, actually worked out great because i learned a lot in the process and the functionality is now quite good.