Both N10 and N20 do not support DSU because they launched with the Android version less than Android 12. But you can still install GSI with the traditional method. Check you VNDk version with this app and I can tell you which gsi’s are supported by your device.
Here you go: GSI List
Just remove as much permissions as possible. If you want more control rooting is still “the choice”. BTW Banking apps can work with root if that’s the concern.
If you don’t want root. Use a custom ROM like graphene(if your device is supported) or voltageos(if your device is not supported by graphene)
Yeah, it doesn’t.