Try this: Use a paperclip or toothpick to hold the powerbutton "in". Do this when powering on, but hold it in and jam the paperclip/toothpick alongside the button to hold it there. Now unplug/plug the set....
For me, this allows me to control the power with the plug. "Shorting" the power button this way is not permanent...I can remove the paperclip whenever I want, and it works. The only downside is that the remote will not work when the power button is shorted...but like you, I have no need for it in my cab.
Good Luck....this is easy and cheap(free) to try....