Middle pickup

You're best off with a 5-way IMHO. Unless the only thing you're going for is quack, it'll limit the utility of that mid pickup to have it only off or on along with one of the other two. My Gretsch 5622 does this with the mid pickup, and the result is that I seldom use the mid and am actually redoing the wiring this weekend to switch that on-off switch for a 3-way that'll allow me to isolate the mid pickup or use it along with the B/N selector to get all the regular options.
The mid pickup on a Strat is actually a bit of a secret weapon, a lot of guys discount it or just use it for quack like you mentioned but it really has a sound of its own. For example, it's the quickest way I've found to get the Lindsey Buckingham tone; for "Rhiannon," for example, put it on mid-only, roll, the tone down to 5 or 6, and fingerpick. Bam, it's right in the zone.

 

Not affiliated with this listing but you could try this. Three pickups, saddle lock bridge, but tele style controls and shape.

https://reverb.com/item/35341454-g-l-asat-iii-1996-black-with-extra-pickups-free-shipping

I've been watching it and I need someone else to buy it before I spend money I'd rather not once again.

 

5-way with a secondary switch that engages the bridge/neck combo or an all on depending on where the 5-way is set.

 

How a middle pickup will serve you in a Telecaster depends on the middle pickup. To me, a low wind middle pickup sounds good alone and it blends better with bridge or neck pickups. I like the CS ‘69 in my FCS ‘69 Stratocaster. You won’t want to lose the bridge and neck in your Telecaster. Two good options for seven sounds are a Fender S1 switch or a push pull pot. A good tech should be able to wire either option for you.

 

Tele: 5 way, hot middle pickup, so it can be down low, what's not to like?

Strats can definitely take time to get used to for sure. I found at first that I had a lot of trouble. Now, I prefer to mostly play Strats really. But you need to "float" a bit with the picking hand. The volume knob proximity is something great for me. I far prefer a middle pickup tone to combined neck and bridge tone.

 

My Modern Player Plus (replaced the bridge humbucker). Has the stock 5-way switch for Strat tones. Added a push/pull volume pot that puts the neck pickup on no matter where the switch is. So you can get neck + bridge. Or all 3 pickups at once, if you want to get crazy!

Having a middle pickup and a 5-way switch doesn't affect the tone of the other two pickups.