My Hardinge HLV toolroom lathe has replaceable (if expensive) dovetail
ways. I purchased a new dovetail from Hardinge, for around $800,
fifteen or more years ago. The saddle, tailstock and other parts still
needed to be aligned/scraped in, however. Not an easy or inexpensive
proposition. But, keeping in mind what a new lathe of that degree of
precision would have cost, it was all very reasonable. I don't know
what Hardinge would have to charge for that part these days. I hear
that the dovetail can be removed and reground by an experienced shop
that does this sort of work and it is not that expensive.

Cheers,
Norman C