Zero-trust access to Element/Matrix

[lilynet336]

I used to use the "Security Phrase" option in Element Web (self-hosted) to access my account from a new device, when I didn't have access to any other devices. This was useful, say, when at a public computer without my phone on me. The Security Phrase option is not there and hasn't been for a while, leaving me with three choices for account access:

1. Deny verification and not have access to encrypted messaging (including history)
2. Have my phone on me 24/7 and use cross-device verification
3. Have the file containing my Security Key on a flash drive and carry that around 24/7

Is there any way to get this functionality back? I tried hosting an old version of the web app but the option isn't there either (presumably my account no longer supports the feature).