I cut mine in half using a metal cutting band saw but you could probably do it as well using a hand held grinder and a cut-off wheel. Depending upon how good the person doing the cutting is you might lose a row of cups as we did.
For something larger in diameter you might look at the Whopper pans but the cups will not be as deep as athe 3-D pans that you have. You can also find round cake pans down to just about any diameter you want. I used to have them in 5", 6", 7" and 8" diameters, they'll be about 1" deep.
Tom Lehmann/The Dough Doctor