You can always buy an aluminum plate, some standoffs, and appropriately sized fasteners and make your own heat shield.
Then again, unless you have an exhaust that blow directly at the pannier, you'll probably be okay. I've had Givi V35 panniers on my VFR1200F, and the 2Bro M5 titanium can I shortened to fit under it came within an inch of it. The can blow rearward about parallel to the bottom of the V35, which has no heat shield. I've had no problem.
'18 Ninja 1000, '18 Street Triple R, '18 KLX250S, '15 250XCF-W, '14 K1600GT, '05 GSXR600 (track)