LC on/1 off/LC on comes with it's own gremlins, such as post-release schedule checks (or straight-up LC assignments) on the last LC day for assignments on the first LC day after the X day, integrating your X-day into the 30 hours of rest between them. Second day coverage allows this.

Wait, I just re-read your post. Are you suggesting a strategy that tries to maximize the use of X-days as 30-hour resets? That sounds like a terrible idea if so. Doing this would maximize your LC availability.

If your answer is "yes, to maximize pre-posted rest", I'm not sure you've seen the plethora of posts (including my own experiences) that they CAN AND WILL remove pre-posted rest at their leisure.

I've personally been on all sides of this. I've been assigned a trip when junior had rest and I didn't. I've been skipped and the trip went to senior because of my rest. And I've been junior with the rest while senior didn't, and they removed my rest and assigned me the trip. There's no silver bullet here for pilots, scheduling has full control of what used to be RUO with this ****.