If the physical connector on the frame is not damaged, then find another power button. If it is damaged, replace the frame (this will require much more work, and you should look at the guides for removing the LCD and digitizer). A droid 1 frame should work and you can get one cheap from a water damaged phone.
I just tried it out. The droid 2 motherboard can completely be swapped into a droid 1 frame, provided you use the back housing of the droid 2 (the headphone pins are slightly different in layout). the only issue resulting from this is some mismappings in the keyboard, and the switching of the back, home and menu buttons on the digitizer. The LCD works perfectly. This implies the flex ribbon is the same in the droid 1 and 2 as well. The only thing to watch out for is i have seen some part stores sell two types of digitizers, one that has a narrow connector and another with the wide connector. My answer only applies for the narrow connector, and I haven't seen a wide connector ribbon cable for sale. Hope this helps people.