Any fab shop should be able to do this.  This is a simple procedure.

It is a simple procedure for shops that understand where the stress areas of the swing arm are located so that they can be strengthened in those areas.   Make sure that they do not cut the swingarm in the wrong spot and upset the design of the shock linkage or the operation of the disk brake caliper.  We usually have to revalve the shock, change the shock spring and lengthen the brake line on the swing arms that we modify.