Yes that’s pretty much the work around I have been using except that I pull up two tabs in the browser log one into Astroprint and the other into Thingiverse. Then I do a search on the Astroprint Thingiverse app based on keywords from the things in my Thingiverse account. This almost always works except if you try to do a search for a remix. It will not find it. Searching for the ID number, the name, even the link to the thing does not help. The Astroprint Thingiverse app will not find it. For those I have to download the thing then upload to Astroprint. So there are workarounds it would just be nice to be able to do it all from the app.
Matt