good piece with a lot of important things to think about. thank you for sharing.
i think RedReader which is a reddit client available on GooglePlay and on F-Droid handles this issue in a really great way. You can add multiple accounts to the app and switching between them is fast and easy--no logging out and in involved. You can also browse anonymously.
The reason I think it handles this issue so well, however, is that when you make a new post or comment, you can choose right then and there which account you want it to come from. so if you are logged into your meme account but see a post in r/science, you can easily comment from your professional account. Also, unlike any other reddit app i have encountered, you have the option to force all traffic through Tor (via Orbot); if your Tor connection is interrupted, the app does not default to the clearnet.