Recovering old package from Macports - archived somewhere?

I was in the process of working through how to get the local web-server version of Joplin 3 (based on the mobile version) compiled on macOS 10.13 High Sierra (because the GUI absolutely will not, being dependent on features that didn't exist until later OS versions), and writing up a detailed tutorial on the process. The only way to do this is with Node.js 21, because 22 and later are inoperable on macOS 10.13. Can't use Homebrew for this. MacPorts handily provided Node 21 and the ICU 74 it depends on. Then I needed to reinstall Node 21 for some reason or other (stopped running due to some library being upgraded and the old one removed). THIS VERY WEEK, MacPorts decided to delete Node 21 from its offerings, right out from under me, and forces an upgrade to 22, which won't compile on my OS. So, all this work for nothing. Is there some repo somewhere with older MacPorts packages that they no longer want to provide support for? It seems unlikely to me that the package I need has disappeared off the entire Internet forever. Trying to do something like sudo port upgrade --enforce-variants nodejs21@21.7.3 fails; it just forcibly tries to install @22.whatever anyway.