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What do you mean by reinforce the poor A307?
If the bond strength is what you need, I dont think it matters what the steel anchor bolt is, if its steel strength controlling, having a much stronger adhesive wont help. The connection is as strong as the weakest part, steel, adhesive, or concrete strength.
So are you proposing new anchor roads epoxied inside of those? Wont that increase your load, due to smaller moment arm, how much tension do you have on the poor A307 right now?
As for a torque wrench, if a contractor cannot afford one, then I dont think I would want him on my job.
if you move your anchors inside of the poor A307, the moment arm is smaller, thus a higher tension load in the bolt.