Hi Per
I'm just catching up again.
I don't know where you are based, but are you thinking about printing locally? If so try sending the job spec out and see what sort of response you get back, you might get lucky and get a relevant conversation going. Or do you know anyone in graphic design that works regularly with local printers. Some companies will only deal with very straightforward / undemanding CMYK work and just churn out volume. Ideally you want a company that is able to deal with custom colours and has the understanding of their own workflow software to control specialised workflow.
As you are familiar with photo inkjet printing and RIPs then you appreciate the secret sauce that each printer manufacturer puts into their workflow, the workflow and software within litho prepress is just as convoluted (if not more so). Any solution offered by one person may not hold true for the final print company.
I have just had a quick look and found
https://printplanet.com with a wide range of forums.
A quick look for "speciality BW book printers" yielded a selection of book publishers (and many others). Their are a lot of independent publishers and printers offering short run book printing. A bit of digital leg work should give you an idea of quality levels if they are showing off their customers work.
Even a trawl through local library or book shop at niche B&W work might give you some ideas for printers.
Get samples if possible and even spend a bit on a test print before committing could save a lot of stress.
Hope this helps more than confuses!
Gerald