Lightroom :: Adding Further IPTC Sections To Print Outs

I am photographing and cataloging the paintings and drawings of an artist. There are over 3,000 of them. LR is such a good database that I am hoping I can use just that and add the details into the IPTC data - Title, Medium, Date created, Size, Price, whether sold and to whom, and  - crucially - which shelf in the artist's store building they are located.
 
My idea was to use SlideShow Pro to publish the catalog to the web for dealers to browse, and my experiments show this would work very well, with IPTC data available on mouse-over.
 
I also need to produce a catalog with images and info for the artist's assistant so that she could quickly locate a requested painting on the correct shelf. Again this seems feasible up to a point as it is possible to print out the photos with IPTC information.
 
BUT - and here is my problem: I do not want all the info that the artist's assistant needs in the catalog to be available on the public slideshow, so have put different bits of info into different IPTC sections. But then I come across the limitation of printing in LR  - only one section of IPTC info is allowed.
 
As it is I am at the moment also entering the info into a database (File maker Pro). I find on a good day with the wind behind me I can crop and adjust and catalog about 30 paintings an hour in LR. Also adding the info to File maker nearly doubles that. And more importantly it will be clunky and prone to error to have to alter or add to two separate databases in the future.