Seeding an initial deduplication client backup with non-MSDP backup

I have used this procedure several times: https://support.symantec.com/en_US/article.TECH144437.html
but always only as it was intended, using existing backups in the MSDP to seed new clients to the same MSDP.

So now I have a client with some large remote file servers which I want to pre-seed the central MSDP with before we attempt a client-side-dedupe backup over the WAN link.

I was thinking that theoretically I could dump the clients backup to BasicDisk/NAS at the remote site, have them ship it in to the central site, import the backup, and duplicate it to the MSDP, and use it for seeding. Before I spend time testing it, I wanted to know if anyone tried this or have a better idea?