Profile Type - User Upgrade

Hi guys, i am trying to figure out a scenario for our users and need your input on this to save me some time searching around. Let me know if what i want to achieve can be done in easysocial and how.

I have a "default" profile type for our users. All registered accounts are assigned to this default profile type.
2. I want to define another profile type that is basically the same as the "default" one but contains few extra profile fields

Is there any way i can allow our users to "switch" to the "upgraded" profile type ?

Basically, allow them in their account settings to choose a profile type and if they choose the "upgraded" profile type, automatically they will have acces to the extra fields

From my understanding profile types are "standalone" in such way that if the user will choose another profile type he will loose the previous fields records, even if the new profile type they choose contains these fields + few extra.

Long story short, i want to define just some "extra" fields in different profile type and let the user to "activate" those fields in their profile by choosing the "upgraded" profile type.