I just tried a 7 sat zap - it doesn’t look like it will fetch invoices if it’s that low.
Definitely something to consider, but my main aim is to promote self-custody and easy Bitcoin payments, so I’m going to be moving towards this model irregardless of >10 sat micropayments.
I’m still working on getting Bitcoin payments set up at the business I work at, and this could be a potential solution for online ordering!