Local home folders to Network Home folders migration

Hello everyone. I've recently taken on the task of converting our infrastructure from OpenLDAP to OpenDirectory, implementing Profile Manager, Network Authenticated logins, and a slew of other services to help wrangle my organization of ~150 Macs. This is on the latest version of Yosemite+Server App

I've got the basics covered, OD master and replica in place, and profile manager handling devices properly at the moment. What I am currently planning out, is the migration/enabling of the Network Authenticated logins. Currently machines are configured with local user accounts, and OpenLDAP handles authentication of other services like file sharing (to EMC Isilion Cluste), VPN, RADIUS, etc.

Knowing that it would be hugely disruptive to start fresh on all of these machines, and that our network bandwidth won't support network home directories, I now need to figure out a migration strategy, and get advice on what pitfalls to avoid through this migration. (I am backing up)

First, I've imported the OpenLDAP users and their UIDs. I've done this to keep file ownership for data on the Isilon cluster/Filesharing. My concern now, is for UID permissions on the local home folders and their translation to their network bound accounts. I'd rather not have to go through to each machine and adjust UIDs and permissions for each local user to match their network UID, but I'm not sure if there's another way. I'd also rather not have to migrate data around on each individual machine.

One thought I had, would be to import the local user folders (from the machines) to their matching network home folders, enable "mobity", delete the local user accounts (on the local machines), then have them sync at login/account creation. To me, this seems like it would counter any permissions issues between network login UID and local UID, but has the high overhead of pushing around a lot of data, introducing possible corruption of data, or just straight up mucking things up.

A second thought would be to utilize Time Machine, backup, login with the network user, then restore from TM backup. If I'm not mistaken, the imported/restored information should take the new UID of the user information being restored?

Some thoughts, tips, and tricks would be welcome. If I'm totally wrong on this, please suggest a better way.

Thanks!