Re: Warm, low-output Strat-sized single coil for neck pos?
If you figure that a SL59-1n is going to be too warm and round, you can consider the Dimarzio Cruiser DP186. Personally I think of the Cruiser as being a very under-wound PAF pickup. However you generally need to use 500k volume and tone pot. Maybe for a Tele the cruiser would be a nice choice with 375k volume pot, as Fender has used in some of the Tele custom guitars. The SL59-1n is warmer when you use it with 250k controls, compared to the Cruiser using 500k volume and tone pots. I suggest using a very small treble bleed cap with the Cruiser if you want it to sound more like a strat.
I like both the Cruiser and SL59-1n. If the guitar is HSS and using 500k controls, then I prefer the cruiser. Otherwise the SL59-1n with a 250k volume pot has fantastic tone both clean and with overdrive.