OP, getting the cartridges you desire to feed reliably will be the real issue.
As for cost of rebarreling, reprofiling the receiver?
$400 for a barrel, $150+ to thread/chamber/fit for headspace. $100 more if you retain the original rear sight and install an iron front sight.
Then, maybe another couple of hundred to reprofile the feed rails on each side of the receiver, unless you're confident/competent enough and have the proper tools to do it yourself.
Because of the claw extractor and controlled round feeding, the rifle's extractor will need to altered for the diameter of the new cartridge and makes it very difficult to convert to a single shot.
Soooooo, At best, if you do the work yourself, $500. Because of the size of the thread tenon, finding a take off barrel that will fit is difficult. If you need the fitting work done, add another $300.