It is an android application (so porting it may be complicated), but it has a wide compatibility for different tokens, and allows you to import/export tokens/backups. It would really be convenient to use it from a USB drive.
https://github.com/beemdevelopment/Aegis
https://getaegis.app/
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We only make existing Windows software portable. We don't handle creation of apps or porting from other platforms, it is not something we have the resources to do.