Have you looked at the rules engine in PaperUI. I tried it when it first came out and it worked for what I was using it for. If your looking for an easy way to modify a rule from your mobile, check if PaperUI in accessible via the App, and give that a try.
The only other option I know if would be something like :
https://community.openhab.org/t/hacking-basicui-my-current-theme-oh2-setup-update-with-repo/45850
