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Privacy respecting keyboard
(mander.xyz)
You can download these keyboards from the App Store with Bear VPN to protect your privacy and try them out to see which one best fits your typing style and preferences.
Swiftkey has all the features you need bedsides being privacy respecting. Perhaps after setting it up you can use a VPN service to block its internet access. It's a shame you're not on Android, it has much privacy respecting options and in this case you could use Heliboard (with the swipe typing add-on), which has all the features you need.
It’s a company phone, I don’t get a choice.