Here's the recipe:
https://www.brewersfriend.com/homebrew/recipe/view/1167371/the-big-lubelski-bf-quarterly-recipe
Note it uses a LOT of epsom salt! The Mg seems to be necessary to the flavor profile (it comes out tasting sweet rather than smoky). I took the acidulated malt out of my original recipe and added 1ml of 88% lactic acid to reach mash pH of 5.4, whatever adjustments you think are necessary should work. Water: Concentrate on the Mg levels and the SO4/Cl ratio. What I put in works for RO water, assuming 5 ppm alkalinity (CaCO3) and 0 TDS. The water profile calls for 80 ppm alkalinity - don't add any unless you need to raise pH.
I see you have been doing your research! My recipe is based considerably on some of the sources you cited. I have a grand and elaborate step mash profile that I can do with my system, if you can't, 150° F for an hour should suffice. If you can get the Polish hops, use those; otherwise, Saaz works just fine. I add 2g yeast nutrient at 10 mins left on the boil, it's cheap insurance, you don't necessarily need it.
One more thing: Rice hulls. Lots of rice hulls. The wheat malt will set up like a bowl of Cream of Wheat (Farina) if you don't use them. I have 14 ounces in the recipe, a pound might be better.
Any questions on unit conversions, please ask.
Cheers and good luck with it!