Single page login for member area (multiple member area setup)

Hi,
I'm battling with the member area setup. I have a Free & Paid member area. I am trying to create what I think is fairly standard login flow for a member area:

• Single page/ popup for all members to log in.
• After sign-in, the user is redirected to the correct homepage for their respective membership type. 
• During signup, select the specific membership type they want. 

I can't use the default setup. The default "login"/ account in the header takes the user to the customer account sidebar, not the member area home page (the member area is not accessible via the sidebar). 

Anyone know how to do that?

thanks in advance. (website is oya.team in case that helps)