No I you want them to do eva then just UMMU.
The recovery addon was intended as a supplement to Gemini 4.5, but the spashdown/recovery sequence required a separate Gemini model because the hatch opening, marker dye dispersal and floatation collar/liferaft deployment were not coded into Gemini 4.5.
There's no EVA per se, just picking up the astronauts, which are separate meshes (with attachment points).
I think you could have either the basket or the horsecollar. On a base attach the collar or basket to the hook. Lower away and then attach to the astronaut and raise away.
I'll take your word for it since I'm not familiar with UCGO/UMMU. I've
flown Orbiter for many years, but the extent of my addon
making was helping Saturn V with the meshes & texturing.
One thing that might work is if docked in flight. then you could transfer from the collar to the copter?
Again, not quite sure what you mean, but it it works, that's good enough for me. IIRC, Mercury 5.0 required something along those lines. Seemed somewhat confusing & unrealistic, but that may have just been the limitations of Orbiter at that time.
Now that you mention it, if everything comes together with the Gemini recovery project, the helicopters, carrier & destroyer would have applications for quite a few other Orbiter addons (Mercury included, but I don't know how many folks still use Orbiter 2006 since Mercury does not work very well in 2010. Were UCGO/UMMU compatible with 2006?)
Since the carrier/destroyer, helicopters, Gemini & astronauts are all inter-related and must all work together, I guess you will need the meshes/textures, configurations and scenarios for
ALL of them to set it up properly?
And how will adding UCGO/UMMU affect the operation of the models as set up in the SC3 configurations?