Good thing I have neither a board or a CFO.
But to respond directly, I think you're down playing how much of an advantage over paying (as you've put it) can be for acquiring great talent. Great companies are built by great people. Paying them well for the work they're doing regardless of where they live shouldn't be a controversial opinion.
In a post-covid, SaaS based world I just don't see how location matters at all. If I'm in Omaha Nebraska I pay the same amount for an item on Amazon as someone living in downtown San Francisco. The internet flattens.
If you want to reduce your candidate pool by 70 or 80%, by all means, go for it, but there's a clear market reason why folks are paid geographically.
Cripes, US$150k is good money in London and that's a considerably higher cost location than rural Kansas.
One thing it does not flatten is time zone. When two team members have 11 hours difference, their ability to collaborate is very limited. It's reasonable to discount the pay of employees who are too far in time. Alternatively, avoid hiring people outside of +/- 4 hours from the mean (unless they are the best in the world in something).