tS no winter package on Tire Rack?
 

I have a tS and was curious if the wheels/tires that work for PP would also work for the tS?

Also is there any wheels that TR sells that don't require alternate lug nuts?

Also curious about this!

try brz with PP package, if brembo fitment you are after.
Twins stock lugnuts are of very common for aftermarket wheels 60dg taper conical seat. In most cases stock lugnuts will do.

Is there a Tirerack rep who can give advice?

Yes; anything that will fit the PP should also fit the tS. The biggest issue will be the brake calipers, which are the same between the two trims.

I was going to park it for the winter and drive my beater car but then I’d be missing out on driving the BRZ so much.

The tS has the same brakes as the Performance Pack vehicles. Just select a PP variant, and you should be fine.

Most wheels that fit the twins will probably clear with small 5mm spacer.

I don't want to mess with spacers, do you think wheels certified for PP would work with tS?

as others said yes as they use the same brakes

Let me tell you, you won't miss the rust. If you have a car to DD and not drive your BRZ in salt I would recommend it.

It was a lot of fun working on my BRZ with mininal rust. Mine was exposed the first year but after that it was off the road for winter. It did start rusting the exhaust and some fasteners but not too much.

Anyway that is my opinion. I tracked and had track parts on my car so may be different for you.