This stuff is embarassimg. I swear, next time i travel I'm gonna have to claim I am Canadian.
The stupid - it burns!
I'm American and switched to all that except ksuite over a decade ago. Started with linux back in '95 with Slackware.
I suggest you fully switch to Linux, and use QEMU to host Windows 10. Fire that up when necessary. Most windows software including games can be run in linux with Wine/Proton - no Windows needed.
Best to have 32G RAM, for flexibility.
Once you get comfortable, set up your own cloud. The simple hands-off choice is Synology, but there are good FOSS options. Set up a personal vpn secured with a certificate and a domain name, and you have your cloud wherever you need it.
I use OpenVPN and activate it briefly when i need something on my NAS, then disconnect. Joplin via WebDAV works well with this setup, as do shared volumes.
I'm the same way, been using that for my P6 and P2 XL. I thought the P2 battery or usb-c was failing 4 years ago until I degoogled it with Lineage for MicroG. Zero problems charging it after that, and battery is still adequate. It disxharges faster now, but at 6 yo, one has to expect degradation.
Adaway is the other must-have app for me as it blocks adware, spyware, malware at the OS level.
I will unroot my phone or use a different encryoted phone when i travel overseas because rooted phones are insecure if the bad actor gets physical access.
Written with a slightly more precise wording, they know Linux users have full control of their devices, so cannot keep them from using it in ways the company does not like. In this case, fine. Go away and take someone else's money.
Stated from another angle, they won't support it because they can't hijack it for their own purposes.
Neo Backup on F-Droid. Backs up everything based on how you configure it. Copy the backupsvto your new phone and restore.
It requires root, of course. Yet another reason to have root. I run backup before flashing and copy it to a flash card in case i have to reset or wipe the phone as part of the process, or i screw it up and have to start from scratch.
Well, California was a Spanish colony, sfter all.