Someone brought this proposal to me, I'd like to get others feedback.

Proposal:
EPEL would make its own "devel" repo, with the missing RHEL packages, grabbing the packages from the publicly available centos stream koji builds.[1]  For example, the missing lmdb-devel would be downloaded from here.[2]
We would have a list of missing packages, along with their corresponding source rpm name.  Whenever that source rpm get's updated in RHEL, we would grab the updated missing packages, and regenerate the "devel" repo.
This should work for epel8, epel8-next, epel9, epel9-next

I realize that this will require some up front work, but I'd like to get people's ideas about the proposal.

Troy

[1] - https://koji.mbox.centos.org/koji/
[2] - https://koji.mbox.centos.org/pkgs/packages/lmdb/0.9.24/1.el8/x86_64/lmdb-devel-0.9.24-1.el8.x86_64.rpm