A tech I used to work with had this badass caliper tool that basically looked like a ratcheting wrench with two removable pads at the tip. The long handle gives lots of leverage, and I believe the kit comes with heads that make it useable for rear calipers where you have to twist the piston in.

If I find it online I'll attach a link.

Edit - found it online, doesn't look like it works for rear calipers ☹️

https://www.amazon.com/Fbest-Ratchet-Caliper-Spreader-Separator/dp/B07PW997YJ/ref=asc_df_B07PW997YJ/