it's been a wee bit!
I'm pretty sure this action I made for @draftsapp is the fastest means of retrieving fully-formatted Twitter embed code for content supported by the publish dot twitter dot com tool. https://directory.getdrafts.com/a/2Ah
Open the selected Twitter URL in Twitter's publish (embed) tool within Drafts. If no text is selected, the entire draft contents will be passed.
Open the selected Twitter URL in Twitter's publish (embed) tool within Drafts using the following format:
https://publish.twitter.com/?query=[selection]
I created this action as the easiest means I could personally see to retrieve fully-formatted Twitter embed code as quickly as possible. Here's a very brief video demo.