For folks who frequently swap forks (i.e. rigid fork for one race, suspension fork the next weekend, back/forth) how do you manage headset/crown race compatibility? I assume you end up with matching crown races on the forks so that you don't have to remove/install with each swap? I'm not seeing many resources online where one can buy an extra matching crown race for my headset....is this common? Maybe it's just not something that is 'retailed' often but the LBS would have to 'special order' it from the manufacturer's catalog? Any known retailers sell complete headsets with TWO crown races? Or am I way off track - is there a different way to approach this?
I have done such a thing for many years with a rigid carbon fork for winter and a suspension fork for summer. At the beginning I simply called the headset manufacturer and ordered another crown race for my headset.
Many reputable manufacturers sell crown races separately (or give them away if you call and ask nicely). It is quite common to damage a crown race if it is not removed properly during a fork swap and SHOULD NOT require buying a whole new headset. If your manufacturer won't sell you another crown race, I would highly recommend you buy another headset from a manufacturer that will and be done with it.
Companies that won't sell small replacement parts for their products generally have a "disposable" mentality for their products. If they consider their products disposable, you should as well. I personally avoid such companies as I would prefer to not ride or deal with disposable parts.
I think you are in such a small niche, that there are no dedicated solutions for you. Buying two complete, identical headsets is an option. In general people replace the whole headset, so there is no need for spare parts to be present on the market.
Edited after comment: If the producer of the fork and crown race does not mention explicitly such possibility, once removed, crown race should not be mounted back, because it can get imperceptibly bent.