Too funny and was thinking the same thing,

But, the problem really goes deeper and don't even think that a roller hammer is going to solve the problem long term either.
Hence even anodizing  7050 only surfaces hardens the carrier to an RC of around 69, but you still have the softer aluminum underneath still.  So your still going to have the hammer roller peen'g the ramp face over time as well.

Worse yet, a few hammer strike to the back of the receiver without the bolt fully locked up, is going to end up with the FP stop collar peen'g the back of the carrier channel where the bolt tail passes through, and could end up with the bolt tail binding in the carrier channel from such well.

You could do inserts of harder metal at the contact points of the carrier, but still kind of a waste in the end. The rig math of the action to cycle correctly is gas port size/pressure, spring tension and buffer mass, so even with a lighter carrier, you still not helping anything out, since you end up using a heaver buffer and stronger tension spring to compensate for the lighter carrier, ending up with the same reciprocating mass.same felt recoil in the end anyways.

Simply put, a lot of testing has been done on finding the perfect metals to produce the  rifle parts to promote longevity of the parts themselves, and by trying to go with a softer/lighter metals, ends up not gaining a thing over just having the part wear out faster isntead.   Its kind of like all the hype on TI firing pins with faster lock times, only to find that they have less than a half life on standard FP's, since the Ti pins are know to tip shatter instead.