G-i-r-v-i-n. (Pro-Flex)
I used a flex stem on a hybrid for several years in the '90's.
I'm a cheapskate and wouldn't have bought it except the prices dropped when most MTB's starting having susp. forks.
They made one version that included integrated ti bars. That wouldn't help the OP, though.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer