Congratulations on your success with the female Hippocampus kelloggi, sir! It sounds like you did an outstanding job of nursing them back to health under difficult circumstances and acclimating them to your aquarium conditions. Well done!
Unfortunately, I know of no one here in the United States that is raising the H. kelloggi successfully because of the sort of difficulties you have described with the newly imported specimens.
I am thinking that your best bet to find a H. kelloggi stallion for your lonely mares is to check the local fish stores in your area regularly. The pen raised H. kelloggi are still imported from Southeast Asia on occasion and appear in pet stores sporadically. You may need to find one or more males that have slipped through and made it all the way to one of your local dealers, and then carefully nurse them back to health just as you did with your females.
Best of luck finding partners for your females, Scott. It’s good to hear that you have found the training lessons to be useful.