Tax on product OR checkout: rules for US/EU

Hi,

I’m trying to find a way to stay compliant to a lot of governmental rules.
In the Netherlands, it’s a law to state the price of the product with tax from the beginning; at checkout is illegal. I sell digital goods so I have no shipping.
Now, this is doable with setting the price and importing EU tax rates (not that volatile as far as I know).
This is undoable when it comes to the US. (and: a little less than half of our client base is in the US, the rest in the EU)

I’m looking either at one of the following 2 solutions:
– Have no tax included on the product when it’s geolocated that the customer is from the US, and have it applied at checkout when customer address is filled in. For EU people, the tax is applied on the product immediately.
– Tax is always applied on the product, but will change to be more accurate at checkout when the customer has filled in his/her billing address.

I was really hoping to use WooCommerce Tax or maybe even taxjar, but both only work at checkout… If only I could add these checks on top of having custom taxes on the product…