Linking outside items (from other stores) on Zola registry — thoughts?

I apologize if this topic has been addressed previously, I haven’t seen it.

My FH and I are using Zola for our website. We have successfully received a few Zola and non-Zola items from our registry already, so I don’t imagine there will be issues, but just wanted to see if anyone has ever had problems with adding links to gifts from outside websites before? It just seeks like kind of a logistical nightmare to link people to an external website and assume they’re remembering to click that “purchased” button on Zola so we don’t get duplicates.

The only alternative is creating a second outside registry (At C&B, WS, or something else) and linking that— I’ve heard those platforms’ registries have their own slew of issues as well. Just trying to decide the most foolproof way to proceed.

TIA for your input!