Using Flow Designer EE

I have a flow that ask the user to create up to 5 contacts:

Primary Corporate contact (required) [Bob Jones]

Secondary Corporate contact (optional) [Tom Wilson] or blank

Primary Account Signer (required) [Tom Wilson]

Secondary Account Signer (optional) [Carl Phillips] or blank

IT Manager (required) [Eric Jefferson]

At the end of this part of the flow a new record is created in a custom object.

In addition to that, an option asking the user if they would like to provide infor for a 2nd(additional) account (if they have multiple locations)

What I want to do is give the user a list of 3, 4 or 5 contacts to [ ] select from, to automatically assign to the new account, bypassing the prompts to provide contact data for a contact that was previously provided... Using the [sample input] above, this list for the user to pick from would look like this

[ . ] Bob Jones

[ . ] Tom Wilson

[ . ] Carl Phillips

[ . ] Eric Jefferson

[ . ] Add New Contact

Since Tom Wilson was provided twice initially, I don't want to show him twice in the new selections. (This seems to be the only option at present)

[ . ] Bob Jones

[ . ] Tom Wilson

[ . ] Tom Wilson

[ . ] Carl Phillips

[ . ] Eric Jefferson

[ . ] Add New Contact

And secondly if no one was provided for either (both in ex below) of the optional I don't want the view to look like this.

[ . ] Bob Jones

[ . ]

[ . ] Tom Wilson

[ . ]

[ . ] Eric Jefferson

[ . ] Add New Contact

I would prefer the above to show as

[ . ] Bob Jones

[ . ] Tom Wilson

[ . ] Eric Jefferson

[ . ] Add New Contact

applies to Checkbox or radio button

Maybe the ideal solutoin is to extend the dynamic choice (or create new "VariablePicklist" element) to allow moderator to pick list values from stored variables instead of locking in on only sf objects