@jmpb Thanks! I was going try that before finishing-up with the ECN-2 kit, but alas, did not get to it, as I discovered that the bleach in the kit wasn't quite what it should be.
Despite buying a full 400 foot (122m) roll of 50D recently, I now plan to just use C-41 for development — while still using a custom-mixed remjet prewash.
Hoping to post an addendum to that article soon. I still stand by what I said, but running two different color processes is more complication than I really want.