What I have done:
1. export boastmachine’s bmc_posts table with phpMyAdmin’s export functionality in XML format
2. converted into mysql insert statements with a python script: https://repcsi.hu/teki/files/bo2wp.py
3. uploaded, then imported from the command line: mysql -u username –password=password database < wpin.sql
If your table’s name is not wp2_posts then you have to change that in the script. (and setup the encodings correctly) It’s a simple script, not a nice one, but it worked for me.