I am not aware of any IFR certified plane under 1000kg that can do 140kt+.
But there are ones in the "ultralight/permit/experimental" class which can do say 140kt, have the 1000nm+ endurance, and which are IFR capable in the sense they can safely (but illegally) fly in cloud etc. If you look around you see a lot of permit spaceships with more/better kit than an (old) 747, and there is no prize for guessing what their owners do with them given half a chance.
But these sub-ICAO classses would need a permit for each airspace - not feasible today unless you go illegally and hope nobody notices (which is a reasonable policy).
Perhaps none of this mattered in the old pre-ICAO pre-CofA days. You could have done the trip on a broomstick, without a PPL of any kind.