I dont agree with you on a laser's ability to cut clear acrylic, I watched the machine cut 8mm clear acrylic at maybe 20-30mm/ sec. I suppose it must depend on many factors. I checked today with the rep the machine can cut 20mm acrylic in one pass, however the machine's intended use is for 3mm-6mm acrylic and lots of raster work.
My offer of cutting 20mm is more of a "community spirit " thanks rather than a commercial proposition.