I would take the pickup and transducers of the K2 with me like spare parts. They will do to get you home if the others faile. I´ve got a friend in spain who was using a red pickup with the usual tranducers with the green point for 350 in his racing bike with a 501 motor and it workrd very well when we have been at the Jarama Circuit. To be sure you could fix the ignicion a little late.
If you have severe problems you should try to find a guy called Celestino Cobo Gonzales. He lives about less than 20 km from Santander. Usually he is organizing the hill climb race to Colombres and is well known by the organizers. He probably could help you, because he has got at least a Morini for racing and maybe another and some spare parts as well.
Aaaah, you are going to the Piston Event and not to the meeting of the Indianos in Colombres, indeed?. So I´m not sure if he will be there, because he belongs to the gang of Colombres

The roads around the Picos de Europa are made for the morinis!!! I´ve never been to the rally but enjoying these mountains with my morini several times travelling alone, one of the nicest areas for riding I´ve ever seen.
Have fun!!!
norbert