I would swap SIM card between two minding registering iMessage on/off and RCS on Android. I use Signal Messenger for cross-platform IM. For emails, calendars use Google which is easily available on both platofrms.
Once I get iphone 15 pro or so which I anticipate to be e-sim only, I will probably get a second line for cheap unless my carrier won’t limit free e-sim switching.
One of the reasons for me to use Android will be to get taste of 5G, Android 12/13 (last I used was Android 10), and easier integration with my Linux workstation.
I am pretty much Apple guy who likes Apple ecosystem but likes to leave "walled garden" once in a while and have also Chromecast, Google Home, Linux laptop.