Suggestions by @kissmethardy

Gene Wilder

as M. Chuck in The Grand Budapest Hotel (1974)

Score: +6

Leonardo DiCaprio

as John F. Kennedy in The 74

Score: +1

J.K. Simmons

as Dwight D. Eisenhower in The 74

Score: +1

Steve Martin

as Harry S. Truman in The 74

Score: +1

Michael Keaton

as Franklin D. Roosevelt in The 74

Score: +1

Jeff Goldblum

as Zero Moustafa in The Grand Budapest Hotel (1974)

Score: +1

Jimmy Vee

as Fellini in Flash Gordon

Score: +1

Simon Pegg

as Robotic Drone in Flash Gordon

Score: +1

Sam J. Jones

as Munson in Flash Gordon

Score: +1

Ornella Muti

as Server Girl in Flash Gordon

Score: +1

Timothy Dalton

as Zogi the High Priest in Flash Gordon

Score: +1

Brian Blessed

as Colnel of Battle Control Room in Flash Gordon

Score: +1

Melody Anderson

as Klytus Observer NO. 2 in Flash Gordon

Score: +1

Chaim Topol

as Airline Pilot #2 in Flash Gordon

Score: +1

Max von Sydow

as Airline pilot #1 in Flash Gordon

Score: +1

Alfred Enoch

as Prince Thun in Flash Gordon

Score: +1

David Tennant

as General Klytus in Flash Gordon

Score: +1

Charlotte Spencer

as General Kala in Flash Gordon

Score: +1

Hiroyuki Sanada

as Ming the Merciless in Flash Gordon

Score: +1

Amanda Seyfried

as Dale Arden in Flash Gordon

Score: +1