You're idea makes a lot of sense as long as you don't end up wasting a lot of time shopping. Better make some phone calls before leaving. Bikes in your stand over size are the ones that will likely be in stock or at least available. Make sure the shop can raise the handle bars and has an adjustable stem just in case you need to alter the reach. TT length is nearly as important as SO. Check about rack availability.

I've sometimes wondered how practical it would be to do what you are proposing, buying the ride in country to save money and the inconvenience of transport. Hope you don't get slapped with an import tax.