Cutting Back A Rune Golem?

[Palanan]

The rune golem is from Dragon #343, and I would love to use one as the centerpiece for a series of wilderness encounters. The only problem is that the rune golem is CR 8, and I need it to be about half of that, CR 4-5 at most.

Is there an easy way to cut this down to a lower CR? I assume that reducing or removing the spell resistance would help, and the energy web can probably go, but I'm not sure how to downscale some of its other abilities.

[ComaVision]

It doesn't do a lot of damage so it shouldn't be too hard to edit.

My suggestions:
First, give it a beat up appearance if you ever want to use a full strength one, so they understand it is weakened
Bring it's HP down (to 60 maybe) unless your group does pretty good damage
Remove SR
Remove energy web
Lower damage and DCs on other abilities
I wouldn't change his weapon/damage because it's pretty low anyway. AC is reasonable for CR 5.