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This is then the result of my prying...

As you can see I haven't cleared the aedeagus and the pictures aren't top quality, but it is the best I can do at the moment. Depth of field is very shallow so I have included photos with a slightly different focus.
My own opinion is that it is Rh. trilineata (Collin's sulcatina) mainly based on the keel-like structure on the dorsal (or is it ventral?) part of the phallus.

The acrosticals by the way though they are biserial are not placed in two straight lines, but in alternating pairs which might give the impression of them being quadriserial.

Is this enough to pass final judgement...?

Regards,