You use one engine mount bracket from the 1.6 and the other from the 1.3. Use the kit from Trailtough. The crank pulley and waterpump pulley use from the 1.6. The starter and alternator from the 1.6. Do no grinding on the starter or the block. It's a lot simpler than you are making it out to be.
The best version of this swap that I've found to do is use the 1.3 head on the 1.6 8V short block. You will need the 1.6 conversion kit, head gasket set, timing belt for the 1.6 8V, timing gear for the cam off the 1.6 because the timing belt tooth profile is different. It has incredible low end and mid-range torque. And there is no need for an electric fuel pump or miscellaneous wiring. To simplify what mounts you need, but it costs more, is to get the engine conversion kit from Petroworks. It has full circle motor mounts that lower the engine and slightly offset it to the passenger side to allow for hood clearance and manifold clearance for the 16V 1.6, it also has a lowered transmission mount.