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A friend had a similar problem: one power meter to be shared with two road bikes (HT II cranks) and one TT bike (BB30 and needing both race and training wheels).
A PT laced to an Archetype has proved a reasonable solution so far: the Archetype is fine for both the road bikes (occasional crits on one) and as a training wheel for the TT bike; with a Raltech disc cover it's also fine as a race wheel too.
The hard part has been the gearing as they're loath to swap cassettes, so one cassette needs to cover a compact double, a standard double and a TT single...
A mate has two bikes with different chainsets (BSA + BB30).
I can't see past a powertap hub being the least hassle and best value for money?
Chainset requries adapters
Crank arms aren't compatible
Pedals require different cleats and are 1 sided without spending big
Powertap is potentially restrictive on wheels