Hey Roberto
The systems are designed with enough flex and gap to allow this minor change.
What your saying is basically true for the older 1st & 2nd Gen Bandits. Holeshot sells a "Touring" bracket that relocates their slip-on lower for bag clearance, using the flex in the head pipe.
However, on Dale Walker's site on Maximum Suzuki, he states that the new 1250 set up does NOT have enough flex in the midpipe/head pipe connection to allow this. He is therefore building a new midpipe which will locate the slip-on lower.
I don't know if the Yosh setup for the new 1250 will have enough flex or not.