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@JayB
I'll bow to greater knowledge but yes this should work - spacing with 9 and 10 speed cassettes is the same and the index (cable pull with each click) is carried by the levers not the rear mech so it won't know the difference. The levers and cassette are the same so the cable pull with each click will be the same as the individual cog spacing.
I assume you'll stick with a 9 speed chain?
Alternatively, i think i have a 9 speed 105 rear mech in silver which is near new as i swapped to campy. I'll check and let you know. Happy to sell if you're interested?