Clauson, if you are planning to hire the job out, I would suggest discussing this with whoever you would be hiring. Or at least having a surveyor
look at it and try to estimate the actual problem and repair costs. Without knowing the structure of that boat, and the extent of the real problem, guesses are almost meaningless.
"the owner states that the surveyor says the the keel bolts "need attention"." This implies that a surveyor has already seen it, and further details should be available. If they are not--that survey
and that surveyor are worthless. Many keel bolts are capped off with carbon steel washers and nuts, and those may bloom into huge rust stains (and worthless nuts) without the bolts being affected. In that case, you may only need to replace the washers and nuts, one at a time, clean up and torque up, to be back in good shape. Or you may need (or prefer) to lower the lower, clean out the joint, and rebed it with 3M 5200. If it is properly rebedded that way, the 5200 alone can be strong enough to hold the keel.
The real question is, are the bolts themselves OK, or what? "Needs attention" sounds like a surveyor who is unsure of what he is looking at, not a survey