moving relocating OneDrive com.apple.FileProvider away to external Volume storage

scratch notes todo to try

these are scratch notes, not a working solution.
but please report success if you understand the core idea and it works for you.
the idea I'm thinking is to apfs mount two volumes, we need apfs xattrs, that's why symlinks don't work.

% cd Library/CloudStorage
one volume should be mounted at CloudStorage because it has no xattrs. 
not cloud provider name, as it needs xattrs which are apfs specific.
so you have all clouds in one place, cannot have selectivity. except iCloud which goes into it's own separate world.

% xattr OneDrive-Personal
com.apple.file-provider-domain-id
com.apple.macl

% xattr -p com.apple.file-provider-domain-id OneDrive-Personal
com.microsoft.OneDrive.FileProvider/OneDrive

this is the user facing view
it creates a user provided path symlink to it at setup, but can be hidden changed later, see below

the internal view, you end up with double storage if you don't want streaming but mirroring
is stored at
"/Users/john/Library/Group Containers/UBF8T346G9.OneDriveStandaloneSuite/OneDrive.noindex/OneDrive/"
the ID might differ
there I should mount the second apfs volume,
but on OneDrive and instead in containing folder, OneDrive.noindex,
which has no xattrs so is suitable as mountpoint

% cd "/Users/john/Library/Group Containers/UBF8T346G9.OneDriveStandaloneSuite/OneDrive.noindex"
% xattr OneDrive
com.microsoft.OneDrive.Macbox.InstanceId
com.microsoft.OneDrive.Macbox.SyncRoot
com.microsoft.OneDrive.Macbox.UserSelectedPat

% xattr -p com.microsoft.OneDrive.Macbox.InstanceId OneDrive                 
Personal

% xattr -p com.microsoft.OneDrive.Macbox.SyncRoot OneDrive
ONED

% xattr -p com.microsoft.OneDrive.Macbox.UserSelectedPath OneDrive
/Users/john/realfolder/OneDrive <- this is where you choose to symlink to at setup.
#I believe it can be changed with onedrive stopped with xattr -w...
#don't forget to kill -INT the onedrive file provider pid which is different than the app.

so I should create two sparsebundles,
store them on samba then mount one in ~/Library/CloudStorage
and the other in "/Users/john/Library/Group Containers/UBF8T346G9.OneDriveStandaloneSuite/OneDrive.noindex"
before mounting they should be mounted in a tmp location and rsync -axPH from original folders to them.
then backup and delete the originals content and replace them with the volume mounts.

obviously this is not ok for moving laptops but only for desk bound ones with stable network link.
or stable external storage, in which case no need for sparsebundle and use two regular apgs volume

mounting idea seen first here https://talk.tidbits.com/t/apple-s-file-provider-forces-mac-cloud-storage-changes/21562/56

similarly it should be investigated how Dropbox works and maybe same principle apply there

second obvious should be one drive not start automatically or find a way to start only after mounting the volumes