There are conversion kits available for this purpose.

However, another alternate would be to remove all the skeleton ket
stuff, then use a high quality wood filler, like DAP's plastic wood,
applied in small amounts at a time over several days. Once it's been
filled in, just use a regular lock install kit and paint door. At
least this way it will look like it's always been that way.

However, I am keeping my sleleton key locks on all my doors. It's
simply easier just to take them apart, clean and lube then, and get the
proper key for it, then reassemble.