Subscription site that gives customers ability to select 8 standard items

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IHAC who wants to build a Shopify site. The concept is a subscription purchase to gain access to their store. Once the annual fee is paid for they get 8 credits for standard items. Can use one credit or all credits at a single time. If customer selects a premium item it’s a $2 up charge. 

is this feasible? Which apps would be best to support the subscription model, lockdown of shopping to subscribers and be able to use credits for standard items with up charge for premium items? Adding one more complexity. Certain items will have required fields needed before checkout on an item by item basis.