Let's wait for the picture. But, I'd be surprised if it worked.

Pentium CELP modules for 440FX must adhere to COAST specification. So they must have a 64bit data bus. Not sure how could that interface with a 32bit 486 chipset.

Most 486s used double banked L2 cache, which somewhat simulates 64-bit memory access. Not sure how it's interfaced however.