The most successful taller front sight installations on 1911s are made by milling the slide for a dovetail slot, and installing a front sight with dovetail base. Staking in a tall front sight is a VERY hard job to get solid enough that the sight will stay put. Been there, learned that the hard way. good luck, though, finding a staking tool. GJ
For the staker, check Midway USA and Wilson Combat for possible tools in stock. Midway has the Strobel tool in stock, which is pretty good. good luck, GJ