The thing to consider when making a scent, based on a "location" such as a barbershop, is that the location will smell differently depending upon time of year and whats in fashion at the moment.
A barber shop called Taylors out on old bond street, smelled far differently in 1890 then it does today. The soaps, colognes, after shaves, and such are all different.
In theory 10 grams of trumpers sandalwood cream and 4 grams of Trumpers Rose cream or violet cream should be about right scent wise.