Do it with two passes of pg_dump. The first one should just make the CREATE TABLE statements. You will almost certainly have to hand-edit this, but it's the the definitions. Change anything that's not plain standard sql (e.g. 'serial' vs 'int auto-increment', anything at all to do with indexes, etc.)
Now use this to create the empty mysql database.
Make a second pg_dump run, this time getting just the data. Probably you need to do it in the INSERT-statement format, which will run more slowly when importing, but if 3k lines is about the largest table, the runtime should be pretty modest anyway.
