[captain jack]

I dont think its a good idea to build a backstop for discs there.
That hill is what gives 5 short its "character".
Wind always blows up from the #6 fairway towards #5 basket, your tee shot can skip off the hill and end up down on the #6 fairway, or down by the alt 6 tee. Its not always overgrown in there, in the winter its pretty clear.
If you make a backstop there, its going to make the hole easier, with much less risk, and thats no fun.
Every hole at Lakewood has clean lanes to play. Brushy areas should be considered a hazard, this encourages good placement.
Nobody wants to play #1 too long because of the brush on the other side of the fence, thats why the basket is where it is, brushing out #5 is the same thing, the brush is part of the hole and needs to be considered when you make your shot.

You could just drag the brush down to the other side of 6 fairway, west of the path, the overgrowth there doesnt affect any golf holes, so its not going to bother anybody if you add to it.