Have a look at this software:
https://discuss.eroscripts.com/t/handycontrol-0-12-0-beta4-01-01-2021-new-script-sequencer-easy-pattern-and-script-creation/94
It has support for patterns, speed increase and randomization etc. and it does not require to sync to a video. Make sure to read through the thread to understand how it works and don’t forget to download the scripts.zip file since that contains some pre-generated templates for what I think you might be looking for. See this post in the thread above for example:
https://discuss.eroscripts.com/t/handycontrol-0-12-0-beta4-01-01-2021-new-script-sequencer-easy-pattern-and-script-creation/94/30