Follow up!
Trying the new "/c polymorph ______" commands works, allowing me to use any form normally available under Polymorph Self. If the custom form suggested by the item in question is available, none of the various guesses I made as to its name worked, and it's not listed under the help.
Trying the new "/c polymorph ______" commands works, allowing me to use any form normally available under Polymorph Self. If the custom form suggested by the item in question is available, none of the various guesses I made as to its name worked, and it's not listed under the help.