Get your sense of balance upgraded to the new and improved 2.35 version. It contains all the features that you need to run endless wheelies - assuming that your wetware is compatible.

Or you can always bend the fork tips together and stick them down the boot of an inline skate. Or screw a length of 2x4 between the dropouts and then nail the 2x4 to a skateboard.

In case the intended humour isn't obvious enough - please note that while these suggestions are doable, after a fashion, they are by no means recommended for any kind of serious riding. For someone who'll willing to stand a tumble or two it might be a fun idea for a lazy afternoon spent on the driveway though.