Why spend several hundred $$ to save a minute or two of air blast once in a while? Certainly the amount of use given the saw the power savings isn't going to make up for it.
I've no ww equipment that doesn't have a motor that's at least as old as OP's and a couple that are well over--mid- to late-50s is the vintage of the Walker-Turner shaper. As w/ OP, an occasional cleanout is all they need to be essentially life-time (or several lifetimes).
The motor (7.5 HP) in the elevator leg house here on the farm dates from about '55 and it gets far harder use for hours on end during harvest in
100+ F ambient temp's and it's still going and will undoubtedly outlast me by a few decades.