I was planning on fitting a BGM Ducati stator plate kit to give me voltage and better starting,
Do I go for a full BGM Ducati kit,
or is it possible to just add a CDI to what I have and would it need a regulator.
I will be putting in a new 12v wiring harness.
So, you are going to the effort of a new harness, but cannot work out if you want to bodge the electrics or not?
It appears to have had a 12v stator plate fitted but no indication as to having a electronic ignition fitted.
Does it have POINTS?
My logic is that IF it has points, it's "manual ignition", if NO points, then its "electric ignition" & therefore 12v already.
Save your $$ for something more fun.
However, yip, adding that little box thingee that suits the blue (Ducati?) coil should work. Just get it going, then work out ignition system, as likely it already does something... just get a 2nd hand one (or borrow one)
unless you really intend to & can justify the upgrade to full BGM.