If you combined this with OW, it'd be a longer and more expensive course. I'm really not certain you'd achieve much beyond turning people away that have no interest in diving deep, which is a heap of the people that do reef dives at resorts. All they want to do is take pictures of fish in 3-12m of water.
AOW cert is more of an 'acknowledgement of attendance', it's not compulsory to progress to rescue diver, which you can do from adventure diver level. Technically it allows extra depth, but in practice people go as deep as they want. The AOW course is an introduction for divers to the specific considerations for a broader range of dives and to practice existing skills specific to each dive under supervision, without adding much in the way of new skills or qualifications. We shouldn't overplay the AOW cert, an OW cert with a few specialties or a dozen logged dives could easily be more proficient in the water.
AOW doesn't necessarily mean deep diving. Maybe the answer is a limited cert for resort trained divers, that can't be used outside of resort diving. Someone who is a certified diver but needs to be escorted by a DM on a dive isn't a diver, should not be certified as one and outside the control of a DM could very well be a danger or at least a burden to other divers, IMO.
As far as expense what is the cost of OW and AOW combined? Probably around $500-600? The OW course at a resort is what 2 days? Two days of training and someone is a certified diver for life. Then the next day they are taking AOW for another couple of days. Now they are certified to be let loose in the ocean as an advanced diver. What a training model!
My original training was by NASDS, 12 weeks 2 nights per week 2 hours per class, 1st 2 weeks classroom, next 4 weeks split classroom and pool time snorkel training and scuba gear orientation assembly, disassembly, handling of a tank etc... The next 2 weeks scuba in the pool drills, drills, drills and more drills. The next week was the written test and pool test. If the student passed then the last 3 weeks were ocean dives, 2 daytime shore dives, 2 boat dives and night dive from shore. After that we were ready to dive safely, confidently and comfortably without a DM because there were no DMs at least that I ever met at that time.
I took a AOW/nitrox class about 10 years ago to have an AOW card to show operators. It was very boring and I dozed thru most of it, the instructor kept having to wake me up. At test time I aced it all did the dives and got my cards. The only new thing to me were the nitrox tables but those were easy. Everything that was taught in AOW and most of the nitrox class were things I had learned in my classes years ago. Gas laws don't change over time and nitrox is just air with more O2, so really nothing I needed formal training to learn.
My bottom line is I've always loved diving and even though I'm approaching the end of my diving adventures after 52 years of diving I don't want to see dive training in the hands of politicians to be screwed up and restricted like our guns. If something isn't done to change the training model IMO govt. regulation of diving will happen.