I'd say that if the 'patch' on the angel has been there for a long time, it may not be BHS at all. As I said, watch their behavior before jumping to treatment.

If they are breeding I highly doubt they are suffering from BHS. Angels will change in appearance over time, and with mood swings, or environment. They fade out, they darken, they develop irridescent patches, cloudy patches from altercations with each other, split fins for several possible reasons...the best indicator of problems with them is usually behavior.
Even with visible issues like ick, you will usually see first either rapid breathing (because it is often in the gills before you see spots) or flashing. Keep up the small water changes, and watch your almorhae. If there is absolutely no behavioral signs of illness, it is probably not BHS at all. Something to be thankful for.

Unfortunately, once the behavioral signs begin you have very little time to make effective treatment. Which is why I brought up the possibility in the first place. BHS is very nasty and deadly. Wait too long and you have a dead fish and an infected tank.
If you can order it online, and it is legal, do so, just in case because you won't have time to do so once behavioral symptoms start. I always try to keep at least a gram negative/positive bacterial treatment, melafix, levamisole, and ick treatment in my medicine chest.
If I were you I'd try to get my hands on some levamisole and keep it in the fridge. Wonderful stuff. Cleans out nematodes, boosts the immune system, doesn't affect the biofilter or plants. I treat all new fish with it and if I am in doubt about an illness it's my first line of defense (unless its shredded fins on angels due to agression or stress or waiting too long between water changes-then I use Melafix).
Diagnosing fish, especially over the internet where you only have owner observations, is a risky business. You really need to see the fish and it's behavior and environment to get the whole picture. That's probably why the vet needs to see them, as much as the fact that it seems to be a legal issue there.
My sincere apologies if my comments led to panic. That was not my intent.

Just watch them, keep up the water changes, and hope for the best. Trucking an angel that is behaving normally over to the vet is not necessary and would indeed be very stressful on the fish--not to mention yourself.