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Don't add timing then! Modern engines are typically a little knock limited but not always. I recall the new Subie FA20 turbo engines for example have very high tumble flow heads that allow the timing to usually be <20 degrees BTDC. On the other hand you have the Mazda Skyactiv engines which will go to 70 or 80 degrees BTDC at the lowest loads.
I would think EGR is inferior to a leaner burn, but if it enables more timing it might work. I think it's worth remembering that there's diminishing returns to having the mix burning earlier in the compression cycle, if you added timing from stock already maybe you overdid it. Why not test it out?
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