It's fine. I'd encourage you to wear them before doing it though, as you might as well break the shoe in first. You can, it's just not common in Australia. Somewhere like B.Nelson in the states will do a danite or commando sole on a welted shoe easily. I think the best we can do here is a glued addition. This brings up a valid point actually. Does anyone know of anywhere which will resole danite soles?