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Other Import users - add prefix to duplicate usernames?

I would like to import a vBulletin 3.8 board into an existing XF board.
There are about a 1000 usernames that conflict because those usernames are the same, but different email.

The XF importer shows these conflicts in a very long list, with the default set to 'Merge with existing user'.
I would like to set this default to 'Change conflicting username' , and automatically add a prefix to those usernames.
This would safe me a lot of clicking!

It seems like a small change of code, but I have no idea where to look. Someone willing to help me with this one?