Replacing corks on a rod is not that easy of a job. I have done it on my own rods. I did graphite lower sections on a few rods for Blue Wolf in a trade labour thing more than a few years ago He still uses them and it was not cheep then .The corks cost an average of $2 + and they are only ½ inch wide .The average rod has 22 inches of cork so 44 corks and one endcap. If the upper section needs to be done you would need to strip of any eyes above the seat . Also if you wanted a grade A job on both the upper and lower section you would also need to remove the seat Probably need to replace the seat as it might get damaged The rod is tapered so it is better to start at the bottom and work your way up
Each one of the corks has to be custom drilled to fit the taper of the rod .After all the corks have been installed the corks have to be shaped or smoothed out on a lathe. I would hate to guess the hours involved
There such a thing a cork filler that you can buy from Rodbuildingsupplies.com or you can make it your self by grinding up reel corks ( not plastic or foam) ones with a cheese grader and mix it with a clear epoxy glue filling divots and cleaning up with acetone
You know your budget better than anyone else
I do rod repairs mainly eyes and tips for some of the local Sooke guides