I have not raised any Arabians for many years. Back when I raised them, I would sell them as geldings and have their registration papers reflect that they were geldings. Then, the buyer MUST geld them as the AHC would not register any foals to them.
I do the same thing now with AQHA colts. If you register one as a gelding, AQHA will not accept a stallion report or a Breeders' Certificate for that horse later on.
As for the cow hock, you are asking for severe problems if you use any corrective trimming on one that is over 6 months old. Cow hocks do not change much even when trimmed as babies. I have ridden a lot of cow hocked Arabians. They would all come that way if they had not been selectively bred so hard for the last 50 years to get straight QH looking hind legs.
When a horse is short backed like Arabians are, the cow hocks let them travel wide behind so they do not over-reach and grab themselves. When I was showing Arabians back in the 60s and 70s, I would get in Arabians to train and nearly all of them had been trimmed high on the inside to make them 'look' less cow-hocked. A lot of them would over-reach. I would have them trimmed level by taking off all of that extra inside hoof and they would never hit themselves again.
I did not find cow hocks to be weaker unless they were real small and poorly formed or were also real sickle-hocked. Then, they were very prone to develop curbs.
I used to geld Arabian colts before they were a year old just like I do my QH colts now. As long as they are dropped, I cannot see one bit of difference in development other than having them develop less crest and having cleaner necks and throat-latches. For me, that is always a good thing.