Hey William,
From what little I can find in my references, the Hotchkiss tanks that the Israelis used were acquired from France.
The one photo I can find in Steven Zaloga's Israeli Tanks and Combat Vehicles, Tanks Illustrated No.5, shows an unmodified (no Germanized cupola) Hotchkiss with the Russian Company in 1948.
There appears to be another Hotchkiss in the background with a split hatch cupola.
It's possible that some of these tanks had been one modified and used by the Germans.
With out any actual colour photos, I'd go with a green colour, maybe French military green.
Maybe even German dark yellow.
I'll be interested to see what you decide on.
Cheers
jjumbo