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Sounds like a fun BMX! Was yours 120mm spaced? The reason I wonder if my foldy bike can manage a 6/7 is because the dropouts are spaced at 130mm. Or am I being daft?
pizzarat-
If my memory serves correctly, it was originally 110mm OLN and I set it to something around 125mm with a 5mm axle spacer NDS and 10mm on the drive side - including the NDS spacer was an attempt to avoid excessive dishing. I know I tried different approaches - before setting the frame I removed the smallest sprocket, and although the next (4th) sprocket didn't foul the stays, the chain did.
I could be wrong about the sizes - it was around five years ago and I've slept since then. Can you lay hands on the 6 speed from Decathlon and measure their hub?
MrE
I suspect a freewheel (6 or 7) will fit the hub but there could well be frame clearance issues.
When I converted a BMX to 1x5 (then 2x5, finally 3x5) it involved an axle spacer, dishing the wheel and cold setting the frame to prevent the chain catching the seat stay when in 'top' gear.