As far as I know, you could always Batch Edit from the Maniphest query page.
https://phabricator.wikimedia.org/maniphest/query/advanced/
Then just search for what you want. In your example for a workboard, you
would search for the workboard's title (rather than hacking the URL). So,
if I want to
If my years of programming taught me anything, it is the evil of
duplication. There needs to be one authoritative source of information. Any
copy is at high risk of being out-of-date or out-of-synch, either of which
make it misleading. For me, misleading information is (much) worse than
none at all