easy way to re-thread sms after PIM backup restore ?

[chagrin]

First off, sorry if there is an obvious thread about this, but the only one I've found was on xda and I haven't been able to get it working.

Ok .. my problem is I backed up with PIM backup, flashed my rom, restored and text messages are no longer threaded.

I've tried the registry edit SMSInboxThreadingDisabled and the phone freaks out / locks up OR disables my threads, then when I delete the key or change the value to 0, it goes back to the same messed up order.

The only other way I know of is to sort through everything in Excel which I'd like to avoid.

If relevant I switched from a juicy rom to vetvito's rom on Telus.

Is there an easy way to re-thread my text messages ? Thanks in advance.