I didnt see the system you mention when I was shopping for one .
I recently installed this system : Motorcycle Tire Pressure Monitoring Systems by Doran . I like this one because the sensor can be mounted internally rather than externally where centrifical forces will cause it to act against the curved valve stems on the 1500 . This kit comes with bolt in metal curved valve stems which are nearly identical to the size/shape of the factory units . So far I am happy with how the Doran system operates . I only wish it would also sense temps .
Soon I hope to have some pics and short story about the Doran unit .
Recently had to limp a member from on here along, where just a set of slightly heavier LED dust caps, started to tear out the valve stem on his 1500's front wheel. I forget how many cans of tyre weld we had to put in to keep his tyre from going flat, but it was at least three and still it wanted to deflate. Only godsend was he was riding a trike, otherwise the fast deflation could have been disastrous.
Personally I would't modify the angled valve stems on a Wing in any way.