Well, after much deliberation and research into MIDI controller keyboards with a view to buying one with Mod Wheel rather than joystick (which doesn't suit me) I totally changed my mind and went in a different direction.
I'm now the proud owner of a used Yamaha AN1x synthesizer. Thank you eBay.
About the same price as a good 5 octave controller keyboard.
5 octave velocity and aftertouch keyboard, splittable, good big PB and Mod wheels, ribbon controller which is also pressure sensitive (situated just above the wheels), two expression pedal inputs and hold, 8 rotary controls and so on. Arpeggiator and pattern generator. Of course MIDI in, out and thru.
And the sounds ... my goodness, the sounds.
I'd quite forgotten how good this VA synthesis was ... or is.
Now I can play the three synth engines (AN, VL and DX) I have on cards inside a sound module too!
Just my 2d.