I would not place any obstacle in you way. If my memory is right there are instructors out there that I have heard of who are adaptive divers, but I can not provide any names for you or tell you if their injury was before or after obtaining their Dive Professional Status.
I would put these thoughts out there for you to consider:
1. Cost each year. Any Dive Leadership Certification such as Dive Master and Dive Instructor will cost you $500-$700 (DM/Instructor respectively) per year for your membership and insurance. Even a non-working DM or Instructor is well advised to maintain a level of insurance as long as they continue to dive.
2. Liability/risk/exposure - as a dive professional if something goes wrong, even if you were just there, you may be named in the resulting suit and incur the expense of defense at the minimum. Example a diver (DM) I know of was enjoying a day of pleasure diving as a passenger on a boat, incident occurred, Plaintiff went through the boat roster and named all DM's and Instructors on the boat, working or not in the resulting lawsuit.). Hence the need to for insurance and why many dive professionals only list themselves as BOW or AOW when they sign in on a dive boat and are not working.
3. As a SCUBA diver you are expected to attempt to rescue your buddy up to the point where you are endangered. As a dive professional, you are expected to rescue the other diver.(yes the sentence ends there and the word attempt is missing).
4. A dive professional is expected by NAUI, PADI, HSA, IAHD and other certification agencies to maintain their physical fitness to a level appropriate to facilitate rescue.
5. You state that you are able to do rescue, but it takes a bit to get to shore. Are you including in your rescue scenario that you are leaping off a boat and swimming out to the victim. Not all rescue scenarios you will be expected to handle will start with you next to the victim.
HSA takes existing Dive Masters and Dive Instructors and does a cross over training to HSA DM or Instructor. So you would need to do the NAUI/PADI/SSI etc Dive Professional training first and then do the HSA or IAHD crossover training. You would need to talk to NAUI about their standards and your ability to meet them. HSA sends a reminder of the requirement to maintain your physical fitness suitable for rescue when you renew each year.
6. NAUI standard is, "would you entrust your child or loved one to this instructor or dive master?". Knowing your own abilities would you select yourself as the trainer of choice to train your loved ones? That is the hard question.
Now comes the question, why the burning desire to move to dive professional level and assume all the responsibilities and annual cost that entails?