Umm I did a search for George Kayser and it's a no go. But what I did find stated it's George Kiser. He flew P-40s out of Darwin with the 8th Fighter Squadron, 49th Fighter Group.
He was credited with 7 Kills and had a large lion on the fuselage. He was better known as the "Kentucky Gentleman". He shot down three birds on 27 April 1942, two G4M Mitsubishis and a Zero.
This seems to fit the exact paint profile your doing now.