@strypey
There are some free contacts apps
Simple Contacts Pro (A contacts app for managing your contacts without ads.) - https://f-droid.org/app/com.simplemobiletools.contacts.pro
Open Contacts (Hide contacts away from apps stealing your contacts information) - https://f-droid.org/app/opencontacts.open.com.opencontacts
Not sure about DAVDroid,
Think one of them should work for syncing to nextcloud, although without DAVDroid you'll need the data in shared storage, and it'll be available to other apps with storage peemission
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@strypey
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.. I mean storage permission.
Could use shelter from fdroid to get a work profile and have contact app and nextcloud running there sandboxed, as the work profile gets its own storage.
Itd be nice to have nextcloud sandboxed like this as it stores all local files in shared storage, available to other apps.
App sandboxing is pretty solid and gives what you want if the contacts program will work with DAVDroid (quite possibly it wont) as that will sync data out of the apps internal storage to nextcloud.
Alternative is to use a work profile, then can sync contact data from shared storage, although you may well have to manually export data from within the app into shared (backup?)
I can text and call fine from aosp contacts app in work profile (does the call/txt in personal profile)
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Other thing that helps with work profile is apps to add more share functionality
https://f-droid.org/app/com.tengu.sharetoclipboard
Lets me share by clicking on email addresses (eg. share from contacts in work profile into email program in personal profile)
Other possibly useful ones
https://f-droid.org/app/se.johanhil.clipboard
(May have some different functionality ?)
https://f-droid.org/app/com.intrications.android.sharebrowser
https://f-droid.org/app/de.audioattack.openlink
This one looks quite handy, but gets network permissions..
What phone and Android version you using?
@strypey
Ah, thats getting a bit old for an android device… Nice to keep things going though
Just checked an android Marshmallow phone, it doesnt have multi-user capability, so also wont work for you
The work/personal profiles use android-for-work, get two different sandboxed user accounts wired up to share the same "desktop environment" you can move stuff between them, slightly awkwardly, kinda like qubes-os
Had pleasure to try it when shelter was launched on F Droid a couple months back