Attack range is very powerful in this game. I've proposed similar items before, but with a hefty penalty.
e.g. binoculars: +1 range, -100% attack speed
Even with the -100% attack speed, I think this item is too strong.
I also proposed something like a monk's blindfold: -1 range, +1 multicrit, +25% crit chance.
I wrote this before getting/discovering Hades Helmet.
So, I now know the big benefit of attack range.
But yes, if there is a chance for an earlier access to one, by all means the penalties.
What about sharing exp? -x% exp, but shares exp with the users? Then you can lvl up your supporters, getting higher buffs.