Save yourself a lot of time and money, get a nice new Chamberlin opener, go for top of the line, belt drive, battery backup, and WIFI connectivity. If you are handy these are relatively easy to install, I have installed at least 6 for neighbors and have one myself. I do not believe you can do what you want with the Allistar or MVP openers, but others may have figured out how it can be done. The MVP openers have been discontinued so i would not put any money into these units.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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