i think most of the modern production boards are stronger around the mast track now. Some pre 2000 models seem to be most likely to be less robust, and probably skimped on high density foam to reduce weight
personally i'd rather bust the nose than damage the mast track area. nose is generally quick and easy to fix, from the repairs i've done to my boards. not pretty repairs mind you, but are water tight

the problem with squashing the mast track into the board is that usually it is not easily noticed. You can go on sailing for ages before you realise that the skin of the board has seperated from the mast track, and water is soaking in. Usually u don't realise until the board has put on significant weight. at least nose damage is obvious.
Anyway. It seems from these articles that Jez's knob is the most mast track friendly