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p4 has an [embedded] partition table on it's own. You can edit this table, shrink userstore parition (it's a single partition embedded in p4) from the end, then add a new primary partition into freed space of p4. Then create a loopback device for this new partition and mount this new loopback device (just as it's done with existing userstore parition).
Some additional tasks will be not so easy, but not so hard either. Take a look at /etc/upstart/userstore, /usr/sbin/mntus and /var/local/system/mntus.params.
Honestly, I can't say anything more clear. I didn't try it. It could be tedious. But via this way you'll get separate partition with keeping userstore partition (read: without disabling capability of exporting it through USB) and little (if any) changing of original KT configuration files. Also you can get much more size comparing with replacing of diags.
Good luck!
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