It’s a great idea! Would the ActivityPub protocol contain enough user information as-is? I think it does.
I’m using my Lemmy instance as a personal blog/extension of my LinkedIn. I control the instance and have it kind of locked down policy-wise.
Over time as I master the administration I will post maker projects and other personal projects. So the only thing that keeps you from doing it is how you use lemmy. LinkedIn is unique among “social” medias in that your verified real name and identity is associated with your profile. Nothing stops you from associating your real self with your lemmy account and completely controlling a single instance.
I’m pursuing a hybrid approach. I cross link my LinkedIn with my personal sites so people who find one can easily find the other. I’m at a stage in my career where recruiters actually are welcome because they bring genuine opportunities for my somewhat specialized background.
It’s all an experiment and it will take time to see if it’s worthwhile. In the meantime, I enjoy watching Lemmy grow and learning how to manage my own online persona.