Look what you can do... create a shortcut or an automation, in this case I used the iPhone, then in the settings, go to associativity and link three physical touches on the back of your phone to the action... my action was this: capture screen, access last screenshot and post on X 
Discussion
It didn’t look good... but that’s the idea!
I think you just need to capture the screen and post the last capture on X, then delete the last capture. And ecosystem all at 3 physical touches on the end of the device!
Or you can simply automate the selection of all text, copy to the desktop and post text from the desktop, with the physical touches, used this for translation, when DAMUS did not translate!
It’s not ideal, but after it’s done it saves some time!
Hmmm I don’t see “associativity” as a setting maybe lost in translation?
There is an accessibility tool on the iPhone, where you tapping with your fingertips two or three times back can activate an action, in this case the action is a shortcut in the app shortcuts! This shortcut can simply copy the text you are writing and posted elsewhere or capture the image automatically and post the last captured image! That’s up to you... personally I don’t think it’s safe! You can accidentally activate and post something you didn’t want! It was just an idea!
On second thought, now I don’t think it’s a good idea!
If I find out anything, I’ll come back here!
Looks like someone tried and twitters new policy now stops it from working https://github.com/slaninas/tostr