EECP is an effective way to stimulate the 'lazy' collateral vessels to be more productive in oxygenating deprived muscle. It's an external heart and circulatory assistant that helps the body heal itself. Pain with exertion is the muscle's way of saying, "I need more air". EECP is non-invasive and unlike bypass surgery, there is no chance of infection and graft rejection.
Diabetics are more prone to infection simply because bacteria loves excess sugar in the blood. Moreover, higher blood sugars create sticky glycoproteins that easily clog up vessels. Especially the micro-vessles in the retina.
You are fortunate to not have experienced angina. Cardiologists must outweigh the risk:benefit ratio for each patient as an individual. I think starting with the least invasive procedure is good advice, considering you are asymptomatic at this time.
It seems as though the cardiologist would like to see you better manage your diabetes through diet and exercise. Quitting smoking is a very important step to improve your current health and prevent further damage. Surgeons are very leary to provide expensive and aggressive interventions when patients are unwilling to do their part.
Educating yourself about your conditions is a great leap in the right direction. We often don`t do the right things because we don`t know what the right thing looks like. I strongly encourage you to attempt smoking cessation as you will notice immediate improvements in your breathing and circulation. It may be a good idea to talk to others on these forums who quit due to health reasons. It can be done and YOU CAN DO IT ;o)
Well wishes to you!
Thanks a bunch for your excellent response and advice.