This kind of fast attack vs long sustain may be a bit tricky to obtain , I don't see any better way than using an ebow on a long delay preset. But you'll have to master it , it not easy as you have to learn the reaction of the ebow regarding the distance between the strings, pickups and the bow itself. On top of that you'll have to tap the fast notes with left hand as you're holding the ebow.
This will be the most musical approach if you're into bow & violin attacks, but it's really rewarding as a whole new way of using your guitar.here is a good example : he does not sustain notes often, but it's clearly the most easy thing to do with the bow ( you can sustain forever easily). tapping and getting a good articulation & tone is much more difficult.
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I agree about the long delay as a good solution but I think it might be achievable with a hefty amount of ducking (as @paults suggested) to automate the process rather than needing to ride the level.