Ok. We've had Scream (1996) meets Groundhog Day (1993) in Happy Death Day (2017). Then we got Freaky Friday (2014) the 13th (1980) manifested in Freaky (2020).
I propose the next crossover camp horror be John Carpenter's The Encino Thing. You combine elements of The Thing (1982) and Encino Man (1993).
Tell me I'm wrong. I dare you.
Isn't Chris Landon's next picture going to be 'Scream 7'? So it has to be another 'Scream' crossover.
Wait, he did 'We Have a Ghost' which is 'E.T.' meets... 'Amityville'?