First post, by Maeslin
While waiting for parts to arrive for another project, I've begun designing a drop-in replacement for the infamous integrated-battery DS12887 / M48T86 RTC/NVRAM package.
It's pretty much a small-package DS12885 mounted on a small adapter board with the clock crystal and user-replaceable batteries (probably a pair of LR44/SR44 due to space constraints) that would fit inside the footprint of an existing DS12887 package and drop right in the socket, no alteration required.
If there's interest, I might make a small production batch.