Voiceumana; What a great suggestion. I tried a Nikkor 63mm on my LPL, set previously for a 4x6 print, using the recommended LPL recessed board for a 50mm focal length. To project the -135 neg on a speed easel the head was raised an inch or so; works great as I could then position a Microsight under the lens. The illuminated f/stops were in plain sight and not hidden by their position to the lens board. A Twofer!!! Ill try it out with a 80mm optic later.Definitely you lose bellows extension if the lensboard is recessed, limiting the smaller size enlargements, however it might not matter to you, and you can always use the Setopla until you find a flat lensboard.
You also might be able to find a lens extender. 15 to 25 mm length should be OK.
Wow!!! so as you suggested I can use the 15mm extension with the SETPOLA and save money.
The 601 instructions mention adjusting the head forward (X) to prevent the column obstructing the easel with increased enlargement factors. What a good feature. I can't tell from the illustrations how far the head slides forward.