Thank you. As noted in Struggling to build from 7.22.1 SDK - Ubuntu 22.04.5 LTS, I found a workaround by compiling my own build of bind-client using the SDK. This requires a lot of extra time (1-2 hours each time a new firmware is released) but at least it is a solution for now.
I do hope that nsupdate is brought back in as part of the core distribution.