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If your Benelux will do 4 speed eighth, it will probably work over 5 speed 3/32", which would be a lot more useful, since 5 speed bocks are common whereas 4 speed are not.
I expect you already know this, but all those plunger type Benelux rear mechs were fragile and didn't work that well even before they got bent. It's amazing how much effort was put into promoting a product which was so puny - not that Simplex or Huret were any better!
I've inherited a Cyclo Benelux Mk7 3-4 speed derailleur in grubby but functional condition and a 3-speed 1/8" freewheel. Is it worth splashing out on a shifter or not worth bothering with?
I'm pretty sure the answer is yes, but thought I'd check.