Perhaps you could try the leather shop on first floor of campbell. Can't remember the name although just went there yesterday. they are leather specialist. They sell custom made leather boots, readily available boots and other leather products. They also do repair on leather items.

Went there to check whether they could stretch my dr mart to 1/2 or 1 size longer. Weird thing, after about 5-6 years, I put on the boots, after a long walk, my feet hurts like hell, as if the boots shrunk or my feet lengthen. It could be done, but they could not get the same colour for the rubber between the upper parts and the sole.

So I just get the leather protector/softener first to try to stretch the toe box. If that fails, hmmm.