The challenge is that with a 360 cube, you have to automatically devote 40 slots to a fetch->shock framework. You'll want some manlands; so that really should be the 10 zendikar manlands (though I suppose we can pick and choose, maybe devote 5 slots here). Than we probably want some form of land based LD, either tech edge or wasteland, so thats another 2-3 slots called for. At that point we're either over 50 or within a few cards of it, with no real space for utility lands.
The 50 land cap is just too tight when 80% of land slots are spoken for off the bat, and you still have to achieve a lot in those last 10 slots.
Compare that with bouncelands, where the core package is 20 cards, and I still have 30 slots to do whatever I want with.
That being said, when a format is built to certain specs. you have to respect those specs. as it defines what the format does or doesn't want. The core structure of a shock->fetch format, is 40 slots devoted to fetch->shock. You can change that, but at that point you have a very different format, and have to make hundreds of obnoxious little tweaks across the cube, which will probably either make for an overall worse experience, or result in a completely different format.
Is running a second draft to provide utility lands ideal? No, but thats the workaround, and I have no brilliant ideas on how to restructure that style of format without diluting what it was built to be. The only thing I might try is go down 10 shocks/or fetch, run 10 manlands in that slot, than devote the last 10 slots purely to colorless producing utility lands, than see if I can get away with cutting the ULD.
Anything outside of that fetch-shock scenario shouldn't be a problem, because you aren't committed to anything, you can design whatever fixing restraints you want, and than that can define the way the rest of the format develops.