I got this question answered. I found a dealer with some take off 4000 series mini hoppers. They test fit one to a 3000 row unit and said they will in no way fit.

I also got the entrainer question answered directly from Kinze. Their tech support line called me back within a half an hour. They said their new entrainer will absolutely work with canola. I asked about the older unit and their answer was that they didn't know because they never tried it.