Ausf. F with 3.7 cm Kw.K (L/46.5) and 2 x 7.92 mm MG 34 would be the correct type for France. It wasn't until July 1940, when Ausf F. and G were produced with 5 cm Kw.K L/42, mounted in an external mantlet on the modifed turret.
Creating Ausf. F out of Ausf. J can be a challenge, considering the number of changes introduced incl. lengthened hull, widened suspension components, new sprocket and idler wheels, new set of tracks, unevenly spaced return rollers etc. But having 125 rounds of 37mm and 4,500 rounds of 7.92mm S.m.K. (steel-core armor piercing) and S.m.K.Lichtspur (w. tracer) ammos in 60 double drum magazines sure sounds like fun.
(specs from Panzer Tracts 3-2, 3-3, 3-4)