Using Membership2 to create company-specific portals

We're using the Membership plugin to create individual portals on our site. We've created memberships for Companies X, y, and Z. Each company has a single page which is protected with their membership. I have login redirection set, so when a user from Company X logs in, they end up on their protected page. But, once a user navigates away from that page, there is no easy way for them to get back to it. Ideally, I would love a way to have a button that shows up when a user is logged in. The button would be a link to their specific portal page. Thoughts about how we could make this happen?