Ι was in your shoes 2 years back. Few months after my OW I got a "strong" GUE-F Rec, that is reaching close to tec pass, thus I got training with doubles, canister light, etc... minus drysuit. I will continue with my awful experience and practically a rant, along with the optimal solution to your problem, IMO:
RANT:
1-2 weeks later while registering for a dive with my dive buddy (GUE-C2) at maximum 60' I was refused service when showing my GUE-F card, even after I showed OW card, because "he didn't trust me, and because I may feel like a god and call others strokes (???) but the dive site has a drop to 70'". I guess my cheap perdix computer has issues with depth readings. The owner was at best a certified AH that didn't like the agency, but allowed newly OW trained divers that didn't know how to set their own gear join the boat dive. Going to the other shop (2 minutes walk far) same issues, but this time I was not allowed because I will kill myself with the long hose (through self-strangulation), and I don't know hot to use it. The discussion finished when I quickly put on my gear and literal asked him to try to strangle me.
I decided to get this AOW card to have something to show to miserable entities like the above, and to get the depth extension. Long story short, my AOW training was an uber clusterduck involving an "experienced" incompetent instructor that was insulting me and GUE (with no provocation or response from my side) constantly, and with highlights being myself LITERALLY rescuing a student he lost in a silty lake at zero vis, AS THE ONLY PERSON CARRYING A LIGHT during my first deep dive training at 90', that included finding the student at 200psi and donating air... AND during the PEAK buoyancy class, hovering effortlessly on his face, while he was evaluating me and "giving me tips" at a 45 degrees ankles, constantly holding a shipwreck to maintain balance.
The only thing I learned from my awesome non-"DIR" instructor the first day before she got a cold and pushed me to this individual was handling a stage along with my doubles, search patterns, and basic navigation; the only useful skills I learned in less than 15 min collectively.
So, IMO, a typical AOW for somebody that is thinking to continue with GUE (at any level) is an unfathomable waste of time and money, BUT may be necessary for getting you access in most recreational dives and bypassing challenged individuals running diving shops.
FUNNY SOLUTION:
Do as I did. Take GUE-F and IF needed go for a typical AOW cert. Show to subpar instructors that don't know any better that there are ways to improve themselves and their students by maintaining a better and more confident attitude in the water. Push for a positive change in the community just by existing, and enjoy any insecure cries coming at you.
OPTIMAL SOLUTION:
Get into the GUE class and contact a GUE instructor that teaches also for other (more popular) agencies. Spend the 4-5 days actually becoming a better diver and in the end, assuming of course you perform to a degree, almost certainly any skills you passed or failed for GUE standards, would be an easy pass for AOW pass in the more popular agencies. Few skills that may remain to tick of boxes in the other agency, could be performed in a fun single dive.
That way you both save time, money, and your sanity, while you get additional instruction from a guaranteed top 1% instructor of the other agency that you would have to potentially consider anyway.