I am not sure how trivial script works, but shouldn't you simply make sure that the correct EDU file is in the EB\Data folder before you start playing?

The difference between EB MP and SP is merely in the descr_export_unit.txt (EDU) file. The trivial script overwrites the EDU file in EB\data with the one from "EB\Data\mp EDU back up"* or "EB\Data\sp EDU back up"*, depending on what you select. If you are not using the trivial script, simply copy the .txt file from "EB\Data\sp EDU back up", rename it to descr_export_unit.txt and use it to replace the EDU file in EB\Data.