how might i run the bionic sshd in focal?

focal sshd doesn't answer VX Connectbot.  no idea why.  no problem with
bionic sshd, even if invoked on the focal kernel.  tried to simply
substitute bionic /usr/sbin/sshd into focal, wouldn't start.  works in a
bionic chroot on focal, but from there tunnels don't connect.  i submitted
a bug <https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1877496>, but
i'm not holding my breath for a resolution.

so next i thought i'd try to install the bionic openssh-server package in
focal.  perhaps can be done with dpkg, probably pretty straightforward, but
not very robust.  what i'm wondering is if there might be a way to specify
the most recent available bionic version of openssh-server, satisfying
dependencies from bionic as needed but preferring focal for most of
everything.  any apt-get experts here?

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