Are you looking for the ability to add other rules in the future, or is your requirement specifically about these two items? I’m interested in how much flexibility you would need in your rules setup.
As for solutions for wholesale that may work today. Shopify OOTB discounts do allow you to specify customer segments. Part of item 2 may be able to be accomplished by creating customer segments by tag, then have a few discounts with different discount limits depending on the assigned customer segment. Certainly not as convenient as what you are asking for but I thought I would mention in case you find it helpful.