In the same parody genre of In Like Flint (1967), you might like to check out:
Our Man Flint (1966)
The President’s Analyst (1967) (also very prescient)
The four Dean Martin, “Matt Helm” movies,
The Silencers (1966)
Murderers’ Row (1966)
The Ambushers (1967)
The Wrecking Crew (1969)
Modesty Blaise (1966)
(The totally bizarre) Casino Royale (1967)
And, while only half-spy and half-parody, what would such a list be without the amazing:
Danger: Diabolik (1968)
I’ve seen most of those films you’ve listed. Have you seen “Deadlier Than The Male”(1967) with Richard Johnson as Bulldog Drummond? Of all the 1960s 007 imitators, I think that one comes closest in quality to the actual James Bond films. Not surprising since it was shot at Pinewood Studios(Bond’s home studio).