solid roller vs. solid flat tappet for street??

A lot of the "Pounding" has to do with the profile of the cam. A "Race" cam will have very pounding effects compared to a street cam of similar or what may even appear as the same specs.

If it were myself, and this concern popped up, I would call a cam manufacturer and have a cam custom ground just for this purpose. Tell them what you were planning on and what you expect from the car/engine with all specs on hand.

IMO, the cam duration is not big at all and could live in the street year after year. The adjustment of the rocker arms should not be yearly. It is not a big thing to adjust them anyways, just a pain in the a$$ chore to do when it crops up. (AKA when it gets loud!)