Let me tell you the issue when you have a Humbucker and a Tele pickup together.
Its that the Hum will overpower the Tele by a huge amount. You'll find its hard to mix the two in the "middle" position and you'll find that there is a big volume change when you switch from one to the other ... and in the wrong way, as most players prefer a little bit louder bridge than neck.
So, if you're "thinknig" about a minihum, that is a good thing. P90's are LOUD, and will be as loud as a Hum... so you might want to consider a Fralin pickup - underwound by about 20-25 percent.
I'm picky on my Tele bridge pickups, and the only one that really does it for me is the 52ri Fender pickup. It is not an icepick-in-the-ear pickup, but full and warm (warm for a Tele bridge at least). The 57 Classic will balance with it, but you have to run the bridge pickup very high, and the Hum very low. But, it does work. A better choice would be a Burstbucker #1, which is less hot than a 57 Classic. That would give you a little extra versatility.