There was a 4 MHz 65C02 model .. but not until 1988: The Apple IIc+.
You could lower the clock speed to 1 MHz for programs that relied on it, but the 65C02 did not support the unofficial/undocumented instructions of the original 6502 so there were still some programs that did not work.
The IIc+ was such a refined form of the II. Motorized 3.5" floppy, integrated power supply for maximum portability (I'd take it to do basketball stats for the high school team), platinum color that carried through to Macs until the iMac.
I need to fill out the missing pieces of my Apple II collection. Most of it is still in Brazil, and they are all clones. At least a //e platinum and a //c, preferably a plus, but I can’t be picky.
A higher priority is a graphics-capable VT terminal to act as a reference for a promise I made to the VTE team. Unfortunately, they are incredibly rare this side of the Atlantic.
You could lower the clock speed to 1 MHz for programs that relied on it, but the 65C02 did not support the unofficial/undocumented instructions of the original 6502 so there were still some programs that did not work.