Re: reducing draft depth ?
That last couple of inches of keel is where the most work in ballasting the boat is (weight lower is more effective than high).
So, sure. If you reduce sail by about 50% or more and otherwise ruin the boat or turn it into a displacement trawler.
Keel depth also affects pointing ability into the wind.
Naval architects crunch a LOT of numbers to get the keel right. Noodling with a pencil on napkin is not how to do it.
Lessons learned are opportunities earned.