Running specific LZ self play. Help needed

So here is the thing.
I have specific board position I want to run couple hundred LZ self plays from. So I want LZ to go on playing itself from that specific board, save resulting sgf - repeat 600 times or so.

I could really use some help and/or advice with this. Only tool that could help me doing this is gomill - ringmaster but after looking at documentation it is kinnda over my head. So I am asking good people of OGS to help me figure this one out. Thank you.