The only thing is that you might get a little creep when you put it back together, because the hp seat might not line up exactly the same on the orifice. It shouldn't be much, and maybe it won't happen at all. For me, when I take apart a first stage I like to replace the seat, although that's mostly piston first stages with a large cutting edge on a conical seat. The conshelf seat, if I'm not mistaken, is the same as the RAM. That's a pretty tough seat, I've taken the RAM nozzle apart a couple of times, put the same seat back in, and had no creep.
If it were my reg, I might go on a couple of dives with it, maybe first leave it pressurized for a couple of hours, cycling every so often. I probably would not take it on a trip as my only reg or so a deep solo dive with it. But, if it's working fine and looks good I'd be tempted to just use a little and then when you take it apart you can just rebuild. The new seat is part of the rebuild kit, isn't it?