Challenge: Using a single account (identity?) for federated services?

If a single person regularly uses many services like mastodon, pixelfed & peertube, could there be a way for that person to use a single account/identity to interact with all these platforms.
So that when that person likes a peertube video, the uploader gets a notification from, and when they interact on pixelfed they interact from the same identity.
Instead of the person having to use & to interact with these platforms.

Is such a thing possible?
Could posts / media / interactions all be attributed to a single handle?

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Such an important topic. Thanks for posting @gabe and welcome to Discuss Social Coding!
For reference, our related matrix chat started here.