[p4] Moving users between servers - any good tricks?

[Ivey, William]

I need to split a server's user population into two,
moving about 20% of the users from one to the other.

Currently the "other" server uses P4AUTH to
authenticate from the primary server so these will be
"new" users only in the sense that they are local to
the server now. (These are also the only users who
ever used the other server, so there shouldn't be any
mismatch between file-related metadata and users.)

I've never tried to do this before. Anyone have any
tips?

-Wm