With BDs, the framerate isn't an issue anymore. Region B Blu-rays can be 23.976p just like Region A ones, thus blending is no more.
That is, at least for newer shows. Older shows might still be 50i on BD depending on when and how the show was dubbed, because otherwise they might have to slow down the audio. But this would happen with shows that were originally sped up to 25fps from the original speed instead of the blended ones, I think, so you should be fine in this case too, as far as blending goes.
There is also the "how competent the distributor for the show is" wild card: you might just find blended blu-rays due to that even if it shouldn't happen anymore.