[dsk]

Serious 1911 collectors are only interested in original-condition pistols. Restorations rarely ever rise above the level of a shooter-grade example. Exceptions are the rare guns like an early Colt Navy or a Singer. Having said that, it's your pistol so do whatever you want to it if it will improve the pride of ownership.

 

[dsk]

I was thinking about getting a second slide that was fully hardened so I can safely shoot it. I wouldn’t think that would be a problem.
What do you think?

How much do you intend to shoot it? If only a box or two on occasion you're worrying about nothing. If you intend to put thousands of rounds a year through it then yes a hardened slide will be better, but you should keep the current slide just to preserve its current condition.