Terry,
Have never converted my BBQs but know of a few people who had. Is it not simply a matter of enlarging the burner holes a little to accommodate the decrease in pressure of the natural gas fuel source and using a different regulator / hose line ? The propane side of the PB1100PSC1 is no different than any other propane fueled unit I would think ? Without giving a specific reason why not, I think you should be able to like all your other conversions done.
I know converting is convenient but never thought $ savings after initial cost ( conversion kit ) and running a new supply line was worth it.