I think the best way to reduce reach is to use a slack head angle with lots of rake (to get the trail back to a sensible figure), and a short stem. If you want a high stack I would go with a sloping TT, but not so sloping that you don't have enough standover. If necessary extend the HT a bit above the HT/TT junction. This is better than having loads of steerer or stem stickout IMO.

Agree that long CS are just plain better. Much easier to fit everything in without dimples or scallops in the CS, and you won't get dreaded foot-slap on your panniers.

As for handling my experience has been that your brain just gets used to whatever you're riding and it feels absolutely right after a little while. Low BB makes it nice and easy to put your foot down and will help you achieve the high stack you want. So you could consider a drop of 80mm. I wonder though if a higher BB helps keep one's feet a bit drier when riding through puddles? My touring frame ended up with it slightly higher than intended (because reasons) but I actually really like it.

Do you need a drop handlebar? Could consider an old-school flat handlebar that actually curves backwards towards the rider.

This is my most "trad yet rad" opafiets style build:

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