Getting the key combination of accesskeys in a browser

Per HTML5, there is a JS attribute called accessKeyLabel that should return a string appropriate to the browser, based on the value of the accesskey attribute.

This may not work across all browsers/versions that you care about, however, in which case you will need a manual browser-sniffing-and-branching fallback. 10–20 such combinations are not a "huge" amount IMHO, and the only reasonable recourse.