1997 Other Ford Models Cruise Control

I have a '97 Dolphin motor home with a Ford 460 engine and automatic transmission and cruise control. Is there some way to convert the cruise control to just a throttle control? The problem is; when I am driving in cruise control and approach a hill I have to remember to kick out the cc in order to prevent the engine from slamming from 2500 rpm's to 3700 rpm's in a blink when the over-drive kicks out automatically. Usually I can anticipate when that might happen, but sometimes the incline is so gradual that the accelerator pedal is fully depressed before I realize it. I think a throttle control would be easier on the engine and tranny and on fuel consumption.