You can actually play it and edit the values through upgrading, then save and put it into the map editor, destroy any buildings you made, and the creeper, and Viola! Upgrades!
Yep. Easiest way to do this is assign the needed amount of technytes as a starting value for the map. Pause the map right at the start in the game, select the desired upgrades. Save the map (still at 0:00 playing time), open it again in the editor and remove the initial supply of technytes.