If you have "MONEY" you are willing to spend nothing is impossible.
IF - IF - the measurement across the flats of your 32 cal is sufficient to accommodate the size required for a 50 or 54 cal (which would be "minimally" 7/8" ATF and 15/16" respectively) then you can have another barrel build to swap in.
The cost would generally be in the 350 dollar range plus the cost of bluing/browning if you can't do it yourself.
If your current channel size is sufficient they could be built as flint barrels and again, if you could find a "direct replacement" lock you can tack on another 150-200 bucks for that (for a flint) or the same cost plus some installation costs if the new lock had to be inlet.
At the end of the day, unless your current rifle has some deep sentimental value, you would most like be better off simply buying a used flinter in 50 or 54 cal - it could well be cheaper in the long run, unless you consider, perhaps 600 bucks "worthwhile" to convert your current rifle which maybe has a used value of half that...