Your risk aversion for apps appears to be significantly higher than mine.

You should have a look at gymstro. The guy who wrote it did so because he always sick of apps with cruft and subscriptions. It's a simple free app, no cloud connection or tiered subscription, exports data to CSV, allows program templating, allows for exercise tracking with rest timers and ability to adjust programs on the fly, includes a basic set of exercises but is easy to add custom ones without limits. All of this could change but there's no requirement to update it.

Or stick with your current system that works for you, I don't really have a dog in this race, I just really like the app =)