Import deleted iMessages (from txt?)

Hey folks,

here's the problem:
I accidentaly deleted all iMessages from the conversation with my girlfriend.
Didn't back up my phone enough (i know...serves me right), but she exported our conversation using DiskAid into a txt file.
Is there any way to put the sms in that txt into my iPhone again?
Having them in textform is nice, but I'd really like them to be on my phone again...
Does anyone have experience with Backuptrans software?
Any other solutions out there?

Would really appreciate your help,
thanks in advance! :)