I dont think Id reccomend buying 50 twin hours at a ball park cost of 20k with all the airways charges etc.
How much PIC time have you got on an IFR plan (if any?) As a 2000hr B-Cat going the multi IF instructor path may be an option.
Second to that consider Airwork or Air National. The multi time doesnt seem to be as much of an issue as it is with the other regionals. Just need about 10k for the type rating.
Your quite right - After spending the $$$, 100 multi may not make a difference, besides im sure some on the job experience would be viewed a little more highly that 100hrs private ops.
All the best.