Tom asked:

My first thought is to use a large end mill and do the center of the
pocket then enlarge the dia. with a boring head. Any other ideas?

Use as large an end mill as will fit in the hole with sufficient roughing
clearance. Spiral-drill the holes in conventional milling (spiral drill
gives a better finish in conventional than it does in climb). Then do a
full-depth finishing pass in climb.

You can save tool life and a bit of time (by virtue of faster feed rates)
if you pre-drill the hole as large and deep as permissible.

Lloyd