I replaced the 4116s in my Apple with 4164s. OK,
it's not original (you
should have seen the mix of 4116s that came out of there) and you only use
a quarter of the chip but it doesn't need all those pesky voltages and
they run cooler too.
If the move is to be non-original, just replace it with a 62512 SRAM
from a PC motherboard and presto, 64K-on-the-fly :o)