There are places that can properly resurface lifters. Usually, they should have a slight crown. Sometimes they need to be rehardened.
As you say, new ones are available. I would never install lifters without first having a good machine shop check every one for a surface hardness of RC55 or greater & proper contour. It's just too easy for a soft lifter to slip through the production process. Same with cam lobes.
New lifters on an old cam may be ok, worn lifters on a new cam will cause a disaster. A worn cam with any lifter will cause early failure.
Most cams are ground with a slight front to back taper of about 0.002" which along with the lifter crown promotes lifter rotation to equalize the pressures & wear. I would definitely have a machine shop check the cam, old or new, for proper taper & surface hardness.
D