I think you can just "tap" the power button to get the same shut-down/restart option. At least with my MBP it works.... The hard shut-down only happens if you push and hold the power button, so just click it and see what happens....
Luck.
The "tap" of the power button brings up the window to enter password to get into the system . . . the problem is that the bluetooth keyboard is not connected (along with bluetooth trackpad and mouse . . . . happens periodically). Then, I'll connect the usb "windows" keyboard. With this keyboard, I can enter the password to unlock the system.
Now that the "windows" keyboard is working, I'm looking for a "windows" keyboard shortcut to bring up the shutdown/restart menu (equivalent to control+eject on mac keyboard) . . . . remember, bluetooth devices are not working, including the mouse (can't click apple logo to shutdown/restart)
If there isn't a windows keyboard equivalent to control+eject, is there another windows keyboard shortcut to restart the imac? . . . trying to avoid a "hard reboot"