there is always somebody...
Well I have an element 8.5 08 for my S-Type 137 as a light wind sail.
And I can only recommend it to you (another option would be Glide from Severne...3 cams compared to two, but as the wind gets a bit stronger it is not that easy as element...at very low wind much effective!).
I use an older 470 mast icms 26 and the sail is working really nice, planning realy fast, stable, easy handling, rotates smoothly.
I thing on your amex 460 it should be working...some severne are more lively and faster on softer masts than recommended and so I thing it should be no problem.
Go for it and you will not regret.