You can't sub a .335 tip for a .350 under any circumstances. There's a tip section with a constant diameter (usually 2 to 4 inches) and then it tapers up to .600 or .610. Sorry, no metric conversions...

That AccuLaunch might be a fantastic shaft, but you can find something a lot cheaper with nearly exactly the same performance characteristics. For that price, you may as well custom order a new driver with your pick of shaft.