P-ROC should work just fine in a Monopoly. I've considered redoing the rules because I do really like the layout and the theme is a family favorite, but the rules could be expanded to make better use of the layout. The most obvious example is how the Chance scoop is basically unused in the game.
The layout is really great and for a retheme I don't think you can find a six pop lawlor with an upper flipper and scoop for less. There's a bash you (bank door), disappearing post, a saucer, two diverters... And whatever the weird electric company toy is. Honestly, there is a ton jammed into the playfied for such an inexpensive game.
My biggest problem with the game is how cheap it looks. We can mod it till the cows come home, but so long as there are exposed wires along the ramps, this game looks out of place in my collection.
Every time I think about reprogramming monopoly I renew my interest in it (and re-wiring the ramp-mounted flash lamps and switches), but there's only so much time in the day for these projects ...and my pinball plate is already overflowing.
So, for you? I say, do it! Then share your work with us.