Nice video; concise, to the point.

A 400% drivetrain on a Brompton would be great, 400% is my minimum need. I think the IGH setup indicated is set too high, should be set for a 20 gear inch low and not 30, sacrificing some top-end, but above 85 is just not needed on a tourer. That said, the dual-chainring setup they theorized, would be superior, in my opinion, especially for touring, with wider gear range, easily field repairable, lighter, more durable (especially with touring loads). Choice of which, as asked? This is easy to offer both. However, note: In for a pence, in for a pound; With an external derailleur with 4 cogs and 3 speed IGH, you have the disadvantages of a derailleur, but lack the advantages, as you ***still have an IGH that you are dragging around with it***. Either do an all-internal Rohloff 14 (expensive!), or just go all external gearing, 8 or 9 cogs in back (with a standard 135mm dropout, folks), double crank in front, and be done with it.

People should pay me for such good advice.