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Just a bit slangier, and with slang and/or idioms that would seem a little out of date to today's readers. Copacetic. Ducks in a row.
Start some dialogue sentences using a standardised sort of "Well--" word like French alors or Italian allora, which really don't have any specific meaning in that context but are a sort of verbal throat-clearing. Like Miss Silver's "cough" which is really a sort of "Ahem." Or Ronald Reagan's "Well, you know..."
Depends on how far in the future you are. You really have the problem, in the oppsoite direction, that they had with the recent Robin hood movie, trying to distinguish between the Norman kings and the Saxon Robin Hood. They got around it by using a posh English accent for the Norman upper crust, and a generic "country accent" for Hood and Co.
(Of course, to be "real", Robin Hood movies need subtitles: The Normans spoke Norman French, well and truly dead today, and the Saxons spoke a moderately mutated version of German, Old English, which is also dead today.)
I think therefore that some variation of this ought to work: the character has a few favorite idioms, rather than slang, which are rarely used today, but don't date from archaic times. 40s and 50s would be a good period to mine for less obvious stuff.
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