I don't think the COF should change. At least for me, I like to shoot Bianchi because it is the same and I like to shoot IPSC because it's not. The change is nice. I work on accuracy and technique for NRA and speed for IPSC. IPSC makes me a better Action Pistol shooter and vice versa.
The specialization is no different than Open class IPSC.
My first Open NRA auto pistol was an old IPSC gun with a barricade shroud in 9x23.
Just think of Action Pistol as a fixed time IPSC COF. Learn how to shoot each event and shoot.
One problem with the Cup is the duration of the match and the expense. More shooters would participate if they knew how first class Bianchi is.
But there lies the problem.. it costs the NRA many $$$ to put on the match and pay out the prize money. Therefore, the NRA charges $325 to shoot the Cup.
Also, to shoot the match you have to stay in Columbia for, at least, four week days. Not many people will do that.