SFTP/SCP only and CHRoot

We have a SFTP Server and a bunch of users. The users share files over the SFTP Server with us (not the best solution, I know).

Every user is CHRooted into a different directory to prevent them from CD to a higher directory and seeing the other users (Folders are named after users). another requirement is, that only SCP(/SFTP) is allowed - so no shell. We also want certificates for authentication.

Until now we used SCPonly to meet all the requirements. But SCPonly is deprecated now so we can't use it anymore and need an alternative. Some Googling brought SFTP chroot and rssh to daylight but booth doesn't seem to meet all specifications.

Any ideas or tips how I can please my boss :)l