Burning Tree Shaman, never tested it actually, but it has been suggested in the past. I wonder how he would work out. If the goal is to punish them by damage, wouldn't Pyrostatic Pillar be more interesting against Blue?
Instead of thinking about how to stop their strategy, because a lot of the deck is already dedicated to that, perhaps solidifying our own game play is also an alternative. Someone said more draw. I agree partly for this statement. I think there is already a draw engine but we are not fully exploring it and also a bit more acceleration is needed. Trust me of this deck gets more speed manawise and makes full use of Stoneforge Mystic, I think a lot of improvement will be made.
After some thinking, I thought about Lotus Cobra. I got a lot of motivations, it is a creature which is something you want when playing this rather unexplored archetype of Equipment-Fish, secondly Lotus Cobra is not affected by Null Rod. Thirdly, it is a card that will truly make the mana base so strong that the prison strategy of Workshop will all be useless. Lastly, in combination with sol ring, mana crypt, ruby, pearl, emerald and black lotus the deck has a strong acceleration package. This will cause more explosiveness in general and it is necessary to support this with a strong card advantage strategy. This does not have to be direct card draw.
So Lotus Cobra is a creature based acceleration card that will enable to play both your bombs like Gaddock and Magus AND do things with Stoneforge Mystic/Equip to make card advantage. Because Cobra is fortunately a creature it has the potential to cast the equipment and equip itself in some situations.
I went through the database of equipments. My search criteria were to find something like SOFI but that could interact with Blue. I found Sunforger, really the only thing that made sense to me. There were other interesting stuff but Sunforger really caught my attention.

So I partly went through the red/white instants below cmc four. But I figured afterwards that I could simply play the cheap and effective ones and with a card like Sunforger I can tutor them up when I need them to make card advantage. This is not all, this part is about spot removal like Lightning Bolt, Hide/Seek, Swords to Plowshares, Rack and Ruin... The other application is about responding to the opponent with

. This means there is an offensive and defence way of playing Sunforger. The card to get against Control/Combo would be Orim's Chant. But you can also get that against other decks.
Let's see what we got until now. We got a deck that packs strong disruptive bears which will cause a lot of problems if they hit the battlefield. And we got a good amount of acceleration. We also have plans to invest some of this mana into powerful but also mana intensive equipment like Sword of Fire and Ice and Sunforger.
Wouldn't Orim's Chant be nice anyway here? Similar to Vexing Shusher against Mana drain/Force of Will Orim's Chant could force your bears in acting as a pre-emptive counter.
An example of a turn 1 Cobra:

5 mana will give you a lot of opening options. You can force in (Orim) Magus turn 2. Or without Orim you can get your Sunforge with Mystic and cast Magus without protection.
Another extra to specifically consider with Orim is that it could work very well with Magus in hand on the play. You Orim's Chant on their upkeep and with any artifact acceleration you have a turn 2 Magus and all they could play is 1 land.
Thought on Lotus Cobra, Sunforger and Orim's Chant?