Relatively complex product volume + digital product (incl link) question

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Hello

I have a very simple product offering but struggling on best way to implement. Currently using standard Shopify + Shopify Digital Downloads app but suspect I need additional apps.

I have one product which is a book. I want to offer 3 offerings:

• Single Book order with digital download at £x
• From 5 - 30 books order - each book at £Y, digital download + share a Calendly link to book a Q&A. 
• 30+ books order - each book at £z, digital download, + share a number of links. 

[ThinkBait]

thanks so much - very helpful!