Your options seem limited, do you even have an eye socket you can screw it into?
I use my pressure cleaner (Polaris) socket. I yank the cleaner and twist in my fountain. The water sprays quite high and a slight breeze can force it to miss the pool, I need to adjust it carefully when in use.
If you can't use that return, the only thing I can think of is a mobile standalone pump that you can put at the edge when needed.
Higher priced options include a heat pump to chill or a more economical evaporating pool chiller.