Pre-sale - seminars with variants, digital downloads, video access control

Hi, I'm a Joomla developer evaluating HikaShop Business for a client. A few pre-sale questions:

1. Seminars as products with variants
Each seminar has three variables: location, date, and instructor. Can each combination have its own stock limit (max seats)? And can variants have different prices? So the user choose the location, the date and the instructor (from a datpicker and two dropdowns) and then add to cart

2. Digital downloads
Customers buy audio files, eBooks etc. and download them after purchase. Can access be revoked if a refund is issued? Is there a download limit per order?

3. Video courses (Vimeo-hosted)
Videos live on Vimeo with privacy enabled. After purchase, the customer should access them from the Joomla site. Any recommended workflow for this — ideally using Joomla native user groups to control access?

Thanks!