Sorry wasn't disputing that Distronic requires the automated twin clutch manual box for technical reasons ----simply pointing out that in order to specify Distronic you will have to have spent at least £3,295 on the price of a basic model whatever the reason.
In terms of distronic- a form of adaptive cruise control [ACC ] this is available on manual cars from other makes. Often like ordinary cruise control its disengaged by pressing the brake or clutch pedals or simply disenagages below a certain vehicle speed. This might limit its " autonomous driving" aspect in heavy slow speed traffic but not the advantage it can convey in high speed driving where I feel its true contribution to safety is to be realised.
Cruise control and adaptive cruise control: the complete guide
A friend with a BMW M series 2 coupe experienced a similar problem when he wanted cruise control on his car with a manual gearbox [unusual spec on that model ] to be told when ordering his car by BMW it was unavailable. He bought the necessary switchgear/stalk from the automatic version for the steering column , that and a bit of coding at a local BMW specialist and voila. It was almost plug and play. I suspect that many electronic options in modern cars require very little extra hardware and a bit of programming to become fully functional. If so they are likely to be immensely profitable items for manufacturers and a source of increased revenue stream for them.