There really is not enough information to help you with this without knowing what you have for a grader blade.
You also may not want to bother with it as theory and actual performance may be two different things. I say that because I push snow with a 6 way bulldozer and in theory it seems that angling the blade up in one direction, and then down the other, would net a path free of snow 16 feet wide. It really does not work that way.
I can cast snow 7 feet wide in the first direction because there is some width lost when angling the blade anyway, but on the way back, I can only take half a width because at full width, as the snow pushes to the side, the snow piles up and takes the path of least resistance and starts to trickle out on the other side of the blade...on the path previously made. As the snow piles up on each side of the roadway, I have to take smaller and smaller bites, often times only pushing 1 foot wide paths down through.
In short, angling the blade only goes so far. I end up making far more passes then a person would think, but I am kind of fussy on cleaning up my little snow trailings coming off the blade too.
I am not saying you should by no means do it, I am just explaining that it may not work as good as you think it would, and with an existing snowblower, you may be better off to just not bother. But I can see where snowblowing only a few inches of snow would be frustrating too. Either way, your call.
I am not familiar with the John Deere 3025 so I am not sure what it has for hydraulics; whether it has auxiliary hydraulic ports, or power-beyond capabilities. But with a photo of the grader I am sure we can walk you through getting a power angle onto it easy enough.