my some thoughts to the sensor and lenses.
Indeed the microlenses design of the little chips like 31 and 40 mln as of the big 80 mln pixel could be problematic.
the 40 mln chip seems to be much better for tilt/shift as the older 31, that is simply no go.
You already have the 40 mln sensor- that is not the best choice for the cambo, but it is so.
The 24 mm Schneider would be great for using with non microlenses chips like the older 39 or 33 .
with your 40 mln back the color cast should be the point- the imagecircle would be OK for the little 33x44 mm. the 24 mm schneider is cheap compared to rodentsock, so maybe you could test this combination with a rental lens.
I sold my 24 mm when I bought leaf 12. The imagecircle ( 60 mm), OK, is to small, but this was not the case, but the color cast, that was simply horrible without any movements.
Rodenstock 23 and 28 mm have 70 mm imagecircle, this will be nice for your 33x44 mm chip. I use both lenses on 80 mln back with something like 5 mm movements. The 23 mm has little better corners than 28 mm- that is indeed spectacular, but the 28 mm is older and possible to get second hand. I am sure that both of them will work well with 40 mln microlenses chip also.
Rodenstock 40 mm is a great lens for big shifts: it has bigger image circle that 90 mm. I can shift 22 mm with 80 mln chip. The corners are perfect sharp to the last end. The price of the lens is also not too high. I would say this is the first choice lens for architacture.
Rodentsock 32 mm is a beast, crazy sharp, the image circle is not so big as at the 40 mm, but 17 mm shift on the big sensor are no problem.
32 and 40 mm should have the same 90 mm imagecircle in theory but they dont have, 40 mm have more. In some situations when I shifted with 32 mm to the extreme the corners are not so perfect sharp as with the 40 mm. OK, the lens is wider and it is simply much more difficult to correct such lens. Also the price of the 32 mm is a point: its double of the 40 mm.
I still use also the schneider 35 mmxl with my older 39 back. It is simply great little lens and preatty cheap now on second hand marked. great for 39 and 50 mln Kodek but no go with leaf 80 mln, becouse of the cast. In your situation I would rent this lens also to test it with your back.
Maybe the color cast problem with your back will be not so problematic. This could be the right lens for you.
I hope my experiences can help you a bit.