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@pigfarmer
Ok. That doesn't seem too horrendous.
The problem you have is that the chainset/cranks were originally from a road bike and hance have those protruding parts inside which are called shoulders and hold the inner chainring on. Generally you'll not be able to fit these to track framses, but your obviously isn't
Two options;
Angle grind the shoulders down. This is fairly common, but does render the cranks virtually unsellable if you ever do decide to do such a thing.
But a proper pista/track crankset which won't have this issue.
Eitherway you'll need to re-build the BB with a slightly smaller axle I think, but not sure on that.
I've had this problem myself and can get extremely frustrating. You know your options and I think you know hich is the easiest...