I am also working on replacing a keypad for an MVP unit. In my case I bought the house from an estate. The battery wasn't changed in who knows how long and the acid rotted the unit hopelessly.
I agree you can't get parts, or at least not that part. Not available on amazon, ebay, or any on-line garage door opener parts supplier.
However, a universal keypad should work provided it can operate at 318 MHz (some do, many don't, its old technology). I tried one , made by LOWOHO corporation and could not get it to work. Now I have purchased a unit from LPWPK corporation. If it works (or doesn't) I will post the result. I think it is probably a matter of stumbling upon the right asian manufacturer.
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