Real-time online whiteboard. You can use free services such as InVision Freehand or Draw.io, or more professional tools such as realtimeboard.com, Mural.co, Stormboard etc.
My Experiences Doing Remote Crazy8
Bayu Ferdian
1912

Cool tips! Wondering if it has to be using online drawing tools.

What if we use the original pen and paper, with same amount of time per session. After done each member capture it by phone camera, upload somewhere online collaborative space, then proceed with annotation, silent vote, and discussion.

TL;DR instead of moving the whole activity online, we move the voting and discussion part only. To avoid risks you mentioned below.