The best I've been able to do with my xp-pen deco 01 v2 is forego the drawing with speedgrader entirely and just download all the PDFs and grade them using adobe acrobat reader and then zip them back up and submit to canvas and enter the numerical grades - not smooth at all, but it works (as long as students are submitting PDFs, which is another challenge entirely). The bummer is that students don't immediately see my marked up version of their hw, it goes in as a separate attachment.
I would love to grade with the pen within canvas without that checkbox / delete showing up, as this would be faster for me and more visible to students. Looks like an actual tablet like an iPad would work better with the designated teacher app, but don't have access to such a tablet!
Another alternative which would probably work in your FRQ world would be using Kami through google drive, all hooked up to Canvas - if you have students submit via kami, you would be able to comment with a pen in speedgrader with the Kami app / plugin. Sadly, since I'm having students submit scans of hw they've done in paper (math!), that option wasn't going to work for me without making students jump through even more hoops.
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