I use a waterproof Paramo darkcloth. Light weight, and very versatile.
https://www.linhofstudio.com/products/Focusing-Dark-Cloths-LInhof-paramo-harrison/Paramo_Dark_Cloth
Yes, using swing for architecture is often useful.
Here are three examples from me, doing just that:
--- by atomstitcher, on Flickr
York Minster, Quire & Great East Window by atomstitcher, on Flickr
Five Points by atomstitcher, on Flickr
Those were both shot with a Hasselblad 501CM. The first was with the 80mm Planar on Rollei Retro 80S, and the second with the 50mm Distagon on HP5+ pushed to 1600.
Fotoimpex currently have some:
https://www.fotoimpex.de/shop/fotochemie/spur-dokuspeed-sl-n-part-a-und-part-b-fuer-10-filme.html
It's not a cheap developer though, unfortunately.
I have a few rolls of this myself, but have yet to try shooting any. I have however shot many rolls of Agfa Copex Rapid and developed it with SPUR Dokuspeed SL-N, with excellent results. It may be worth giving this developer a go with the ATP; it is still made and sold.
edit: here are a couple...
I also use the PM45 (never liked using the WLF much). I have the Acute Matte D 42215 screen which has both the split-image rangefinder spot and a microprism donut. I find focusing very easy with it.
The correct formula is CaCl2.
Calcium chloride is not a terribly good choice for a desiccant in this instance, because it is deliquescent. i.e. it will absorb so much water that it dissolves itself, forming a thick syrupy solution which will easily cause a mess.
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