Automatic Multiple Selected Cross Collection (Buy X Get Y) DIscounts

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Hi, I'm looking for a way to offer multiple Cross Collection (buy X get Y) discounts without the limitations Shopify has on them, while still offering multiple discount styles, like multiple codes.

For instance, if a customer purchases a surfboard (or multiple surfboards), I want to offer them a discount from several related collections (surfboard accessories, like a bag or leash etc.), without a requirement for how many items or collections need to be purchased. I'd also like to have any other discounts I choose to be available, and to be able to exclude discounts from each other. For example, if a customer is already getting the discount from buying a surfboard they cannot stack an extra discount code on top of it. I need to have multiple automatic buy X get Y discounts going at the same time, depending on what a customer purchases.

Thanks for any advice.