Herb,
Sounds like you don't get much of a choice in this. I'm sorry to hear that they haven't come up with any good treatment for this issue.
You seem to have a strong grasp of where you are with this, and a straightforward attitude about it.
I assume you're already thinning your blood with at least aspirin, or maybe Coumadin (warfarin), or plavix, or a combination of two. If for some reason you're not, I would discuss the potential benefits with your cardiologists.
Is there a possibility of a drip treatment of a clotbuster for you? There are some Drano-type drugs that can help dissolve some of the plaque, although they are limited in how often you can use them. There are also some drugs that can make it easier for the heart to work with what it has. But if you've got two cardiologists, you've probably discussed those options as well.
As far as strategies:
Before surgery, I found that hyperventilating before and during effort seemed to forestall angina.
I also was careful when lifting to "breathe through" the lift, rather than taking a breath and "setting" my chest. Same thing when squatting or bending down.
These things help to increase the available oxygen in the blood, which is what the heart is likely crying out for. Even though there is not good blood flow in those smaller vessels, if the blood that does get there is carrying more oxygen, it stands to reason that the heart muscle has to get more.
Of course, there is bottled or concentrated oxygen as well, but I suspect you'd rather leave that for the distant future. That likely wouldn't be a first-line treatment, but it isn't nitro or another stent.
Best wishes,