I have already posted the solution on the course forum - shiny laminate stuck to self-adhesive form board and covered with matte spray. I spent few hours on Saturday doing just that. The result is shown below.
And the tools:
I sprayed at first a bit too much. Since I am not using the spray for protection (the laminate is doing this job) but just to cut down on the gloss I am now using much less. I have sprayed about 40 pictures, half larger and half smaller, and I am almost out of the first can. I do sweeping spray horizontally at 45 angle about can height away from the print, then vertically on each picture. It dries almost instantly.
I forgot to add earlier that the pictures are attached to canvas boards used normally for painting. They were on special for $8 each so I got 10 of them in 2 sizes. The large laminator is from China and cost $40. The small laminating pouches are from supermarket, about 10 cents each. Larger pouches cost $20 for 100. I managed to get also 30% discount on printer cartridges (I used probably about $100 worth for 40 pictures). For ink jet paper I used Canon Matte Photo. It gives nice crispness without the shine. I printed on Canon Pixma IP8500 (smaller) and i9950 (larger). They both use the same cartridges so I just have one set and move it between them.
I should have added my husband to the tools! He did most of the sticking of the laminated and sprayed pictures to the adhesive foam boards as I kept on getting the bubbles in!