None to my knowledge but at least a second donkey gives you options (Clutha not withstanding) - but I think the 135 is far less likely to swap ends as the Gazelle had a habit of doing in adverse winds - and a modern cockpit without the need for incomplete 3rd party add-ons for instrument recovery.
I’d take a Gazelle in adverse winds over a 135, every day. The slab side of the 135 is a trite more unreliable than the Gazelle. As for the add ons? Many a great planned IFR flight (as opposed to recovery) in the Gazelle. That said, the 135 4 axis option is a delight v the Gazelle “Human” axis autopilot.