[gentoo-user] sys-kernel/ck-sources going away?

I have run sys-kernel/ck-sources for years and it has been working well.  Just updated and got this message:

   !!! The following installed packages are masked:
   - sys-kernel/ck-sources-5.4.48::gentoo (masked by: package.mask)
   /var/db/repos/gentoo/profiles/package.mask:
   # Joonas Niilola <juippis@g.o> (2020-12-01)
   # Not maintained in Gentoo, multiple versions behind, unsafe, EAPI-5,
   # Use other kernel source / binary packages instead,
   # https://packages.gentoo.org/categories/sys-kernel
   # Removal in ~30 days.
   # Bugs: #716490 (aufs), #739782 (-ck), #757843 (-xbox)

Looked up the bugs. They do not give a reason to discontinue, other than to say these packages are not maintained. 

One bug, 739782, does suggest using sys-kernel/zen-sources instead. But I am leery:

1.) zen-sources is at version 5.9.11. That is way ahead of stable sys-kernel/gentoo-sources at 5.4.80-r1. That would seem to be far into the unstable range.

2.) As far as I can see zen-sources does not have any of the normal gentoo patch set that gentoo-sources or ck-sources uses.

3.) Page at https://wiki.gentoo.org/wiki/Kernel/Overview shows zen-sources in the "previously provided kernel packages" category.

Any suggestions or comments about replacing sys-kernel/ck-sources?

Tom Naujokas (q6dyhzbqaun4hbku at tutanota.com) <mailto:q6dyhzbqaun4hbku@××××××××.com>