Since the 5.3.7.31-SNAPSHOT, you should be able to access admin plugins installed at the server admin from the web admin too.
This also addresses some of the quirks with admin plugins not loading immediately after install etc.
https://luceeserver.atlassian.net/browse/LDEV-2791
This means that for example, my two admin plugins FORGEBOX User: Zac Spitzer can be installed once at the server level and then be used from any at the web admin.
This is especially useful for the performance analyzer, as it needs the debugging to be enabled in the admin context where the plugin is running. (if you installed it at the server admin but had enabled debugging in a web admin, the plugin couldn’t access the server context debugging)