Ticket quote + extra's

I have a very specific challenge and I really hope that I can keep using Squarespace so solve it:

I have an event where people can get a Bronze, silver or gold ticket, with each their own price and limited availability (stock). When selecting a ticket, they must be able to add bus transfer witch is optional and unlimited. Lastly I want them the fill in some personal info. After that they receive a quote / invoice with the corresponding product and info in their mailbox. 

What is the best way to do this? So they don't have to pay for the ticket directly, but after getting a ticket the stock amount is updated and they receive the invoice / quote in their mailbox. 

Can I do this with a service product, or schudule form, or do I need a third party solution? 

Spend quite a few days already looking at multiple solutions, but none that ticks all the4 boxes. Hope someone here can help me.

Thanks a lot!