You could also use the tried and true method of adding a short elevated loop to regain some platform space for accessories.
I grabbed a trestle and will be doing this very thing. The O27 track will probably just be a trolley/gang car/track maintenance vehicle, so it doesn't have to be massive. I primarily want it so I can run something small and use the O27 track to power all of my accessories (with minimal under the table wiring).
Eventually, I've toyed with the idea of potentially adding a set of risers on the main table, and raising the table up about 10 inches. The old space could then be a subway system, and I'd move the main tracks up onto the top level. For future consideration.