I would really love to have this done in an portableapps.com version
As Bitwarden themself states it:
Solve your password management problems
The easiest and safest way for individuals, teams, and business organizations to store, share, and sync sensitive data.
App versions for desktop
Bitwarden is 100% open source software. The source code for Bitwarden is hosted on GitHub and everyone is free to review, audit, and contribute to the Bitwarden codebase.
Is this possible to consider?
Bumping this one...
Yes, please consider creating a portable BitWarden app.
Bitwarden blows Keepass out of the water in terms of usability and user friendlieness. We really need this added to the PortableApps lineup. It's FOSS and it's awesome.