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As a sole reason, this is a bit silly. Thousands of airframes built of simple formed sheet endure far more abuse than your bike will see in 20 lifetimes - if engineered properly, your subframe could do the same. Also, if you are capable of tig welding steel, then it is highly likely you can also learn to weld titanium. You can weld Ti outside a chamber, if that was your concern.

I don't have time to read six pages of posts but when I saw the title to this thread, it immediately made me think of an incident that happened a few years ago in the midwest. A police helicopter claims to have "timed" a guy on an RC51 going over 200 mph. The RC51 was bone stock except for slip-ons. The guy on the bike insisted he was maxed out at 160 mph but the police wouldn't budge from their "calculation." The incident ignited a firestorm of responses from motorcyclists like ourselves that insisted there's no way on earth an RC51 can reach 200 mph. Absolutely no way. Even the editors of major motorcycle publications came out and said that, while going 160 mph on a public road is stupid, unless the RC51 was turbocharged (it wasn't), there's no way that bike can get even close to 200 mph. The cop said he was counting the mile markers on the highway and looking at his watch and calculated the motorcyclist's speed at over 200 mph. He insisted he was right. When the police officer was confronted with insurmountable evidence to the contrary, as expected, he refused to admit he was wrong.