Hiya,
If Dude can do Alu welding then I think it would be easier to move the 4 tabs on the grab rail. Two other points to note; the vendor (Mirco in Italy) says that our Scrambler frames are fabricated in Vietnam with varying measurements (doesn't fill me with confidence and would love to verify) and second he was very responsive and wanted to solve this but currently on summer vacation. So, I'm going to list the rail I have on eBay which would save the buyer £16 in postage and hope someone else designs a rail to work with the bag carriers as, I agree, together the combination would be great!