To answer your other question, no, the multi engine helicopter time will not count for anything in the FW world.. there is very little cross-cultural understanding of each others worlds as not many have done both, unless its on a multi crew chopper on instruments which may give you an advantage at an interview but definitely during IR training and your MCC course..
Do you actually hold a full ATPL or just a frozen which them fancy cadets call a CPL with ATPL theory done? This will dictate hours needed to convert also..