I have the MYNT pen you have pictured and I’ve used it a few times to patch up bad holes or other spots on prints that I did on my 3d printer.
It does the job when it comes to filling spots and am guessing it would easily do what you are describing. I know I find it a little unwieldy (I think that’s the right word) when it comes to making it do intricate things. I’ve seen pictures of detail work people claim they’ve done with them and meh - it’s beyond me. I’m decent with an airbrush but it doesn’t handle the same way.
I guess keep in mind - the pluses is that it uses the same filament you are using so it will match color wise.
The minuses is that it can be inconsistent with the flow rate and can be uneven with how it fills and looks so be prepared to (possibly) do a little extra sanding to get it level.
Navage sorta makes what you are describing. It’s a neti pot of a device that has 2 tanks. One that will hold a saline solution and one for the ‘waste’ water.
You insert the nozzles into both nostrils and push the button and one pushes water into one nostril while the other has a light suction that pulls the water out the other and into the waste tank.
I’ve used one for a couple years and it legit works. Great for allergies and sinus issues. Just google it or look it up on Youtube.