The proposed conversion from Tele bridge single coil to a Tele bridge standard size humbucker is conceptually similar, but the reverse of, what bubbanov did (and I followed suit) with a Squier Tele Special
here.
There's a position relative to the end of the string that Fender came up with for the Tele single coil pickups, that at least allows predictable use of a combined saddle and bridge pickup housing mechanism (bridge plate). I haven't measured, but I'd guess there's one for humbuckers in Teles also. If you get one of those Gotoh or other brand humbucker bridge plates and try to put it on a single coil routed Tele, you'll find out how the position it wants for the bucker overlaps with the single coil rout.
Of course you can be stubborn like bubbanov and me, and try putting the pickup in a position that's a compromise of the "standard" location and proximity to the existing rout.
I get a different tone out of my Tele Special's bridge pickup now, than I have ever had from a Tele bridge pickup. I don't know it it has anything to do with the single coil being mounted a little closer to the neck than the standard position, but that's my suspicion. The tone seems a little Strat-like, as in an out of phase quack. I'm tempted to have it routed to allow the Tele single coil to be in the standard position, the current position, or in between; and then move the pickup around to test the theory. I'd still have to keep the bridge pickup body mounted unless I filled in some of the area where the top of a Tele single-coil bridgeplate goes.
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