How are you using the bars to increase shear capacity? I'm guessing two way shear is govering, I'd probably make a steel column capital instead in that case.
There is some literature from Hilti in the UK regarding increasing the two way shear capacity of slabs using screws installed on an angle. perhaps that may be applicable to your instance.
I've also seen one engineer use drilled holes with double ended headed bars dropped in and grouted on a job I was reviewing 600mm thick slab to give some context to the solution). Project never went ahead because of the cost of this item before I got to peer review this specific element. I only pointed out that punching shear didn't work and they came up with this as a solution before things were cancelled. Looked like they were turning the slab into Swiss cheese to be honest.
This is similar to what Jayrod mentioned. You'd have to do it flipped upside down. Unless it's a big raft footing or, perhaps, and existing footing, it's hard to see this being any cheaper than demo and replace.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
