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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?
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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?