[Problems] Other gametypes, in BMS... to SM?

[Wan]

I have a "5 key" simfile in BMS. In a IIDX simulator it plays fine, but when I try to play it in StepMania 3.9 (in the Pump or EZ2Dancer game modes... I don't have the BM or BEAT noteskin to try that game mode), only the first 3 columns are displayed, and the other 2 are ignored

Is there any efficient way to convert a 5key BMS to SM?

Note: I want to convert the simfile for a reason. It isn't a IIDX simfile.