Zwift does not do custom routes. A custom workout is as close as you can get. Or manual navigation using existing roads but I doubt that will do what you want due to the lack of long climbs.
Is this correct? I thought that, at the same power, any TD would get you to the top in the same amount of time, as it would be the same work. I thought the advantage of TD reductions was that it would allow the user to ride at a lower power (or bigger gear) on the gradient.
actually I probably said it backwardsā¦ its so confusing still to this day! I have no idea 
it just changes the feel, or amount of resistence sent to the trainerā¦
Great list, thanks. I am able to choose some climbs here that represent close analogs to sections of the local climb I posted.
@GPLama did a good video on this a few years ago.
That is most of the benefit. If you have big gearing you cannot do anything about on your bike, (eg 53-39 and 11-25) them trainer difficulty at least lets you get up steep gradients without grinding away at unreasonable (with a potential for injury) low cadence.
It might be a little bit quicker because you may be able to complete a big climb without having to stop, while the 100% may cause you to fatigue at low cadence causing you to stop for 30-60 seconds in a few places.
I am talking reductions from 100% to 75% or 50% however.
Bots might disagree, but bots donāt get fatigued like we humans do, they can go thundering up Alpe at 300 watts and 35rpm cadence for hours while our knees would be wrecked.
100% agree. You know my take on this. I think Iāve been vocal able these climbs since I first experienced them in 2018. Heck, my daughter is named after the Col de la Madeleine, because our experience in that was just so remarkable. I didnāt see floating shapes or sold colors anywhere.
Col? Colin? Colleen? Collette? 
So, does Hamilton or Fuji at 125% sound good?
Iāve done Fuji at 125%.
Iāll not forget it in a hurry.
Imagine Monte Zoncolan at 125%. I donāt even want to ride it again IRL.
That would be horrific. 100% is bad enough.
Fair play for doing that IRL.
Those adjustments would be a resonable sim of the local climb I believe.
Yes, I did a test of a climb at 200% and it was brutal but I was too stubborn to quit. The climb at 50% was actually the 100% version and that was the hardest climb yet.
I tried it once in Fulgaz, good grief! What I thought was appropriate gearing was nothing like it. Damn that thing is so steep.
IRL I have ridden some steep hills (and have one or two short and steep hills nearby) but that one is crazy.
