Most of the sources for shims get them to you in 2-3 days, not weeks. If there's no one waiting for the kit, holding the kit for an extra week is ok as long as you communicate that with me. What is common practice is to return the kit when you're done and have the replacement shims drop shipped to me (with tracking).
The adjustment 1 time only at 30,000 miles? I think several riders here will chip in that they've had to adjust a valve on a 2nd go-around at 60,000 miles or later. Not checking them would be a gamble.
Adjusting all the shims to be slightly on the loose side of the good range is what I try to do while I'm doing the job, since they will tighten up over time (due to the valves wearing into the heads).