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I'm sure there's a reason why not that I haven't thought about...
Mainly that a lot of the TT bikes which are losing their front dérailleurs have weird shaped seat tubes and road-type dérailleur hangers, so clamping to the seat tube is impractical but there's a handy mount to bolt the chain guide to if only the chain guide had the right kind of interface.
gbj_tester
@5awyr
What about a MTB chain guide? Superstar do a plastic cage design on an alu back plate either BB mount or seattube mount. I'm sure there's a reason why not that I haven't thought about...