Webdav or other option with only temporary sync and possibly kerberos integration

We have a working setup of nextcloud 27 in a fully linux based environment. While nextcloud clients are a fine solution for users with their own hardware it is not working with our workstations.

A little more insight:
I work at a student union and we have about 80 theoretical users. But the cloud is mostly used by staff (around 10 people) and about 30 students. The staff usually uses our local debian beased workstations which are integrated via kerberos. Therefor they only have to authenticate once and most services automatically use the kerberos ticket for future authentication.

So far this does not seem to work with webdav and caldav and I did not find a solution to this. Since the user homes ar mounted via nfs from a fileserver an integration with nextcloud-client does not make sense. In the end we would store the data multiple times in multiple homes. We need an access based sync solution like webdav.

So far we added a webdav bookmark and users have to put in their password once when they use it for the first time. But an integration with kerberos and the client based auth would be much nicer.
Any hints how/if we could achive this?