What you are asking for is one of the core reasons people use Enpass for. Building a web version (like LastPass or 1Password) would mean that there needs to be a back end server where Enpass can “in theory” have access to your usernames/passwords to display them to you on your web browser. Many customers are not comfortable with that. In the current device model of Enpass, the passwords/keys don’t leave your device and Enpass can’t access them. I consider this the strongest security feature of Enpass over 1Password/LastPass etc.
For your use case - try using the portable apps that Enpass has made available. You can save it on your USB stick or your email as an attachement, just click and run that file when you are on a 3rd party computer. No need to install and uninstall