I can't see where Automic or sellmyshares will do a NSX trade....

I can't see where Automic or sellmyshares will do a NSX trade. But even if they do its the same price as a full-service broker anyway?

Lots of fullservice brokers will do a one-off sell-only account that are paperwork-lite to save you jumping through all the new HIN/new bank account hoops. Just call their front-desk and tell them you want to sell some shares, and they'll put you through to the youngest broker. They might even have a buyer that they can match up with your selling.

Just be aware that often CHESS will not allow the transfer of an unmarketable parcel on its own (ie: less than $500) so you might want to check this before doing any paperwork at all...