Olympus trys to Calm our fears once more

Do you need AF for macro shooting ?  I certainly don't. The AF motor is  there to get the lens close to where I will finish with MF by adjusting the camera-subject distance  using my focus stage | bellows|  or if hand-held by rocking back-forward.

Have you tried any of the Zuiko legacy Macros lenses ?

The OM Zuiko 135mm f/4.5 is a great macro lens if you want to extend your working distance.
I even tried it with a cheap 2 x converter, and it was so good I bought a genuine OM 2X-A.

See  my recent posts in the Weekly Close-up - all with the OMZ135mm !

Have you tried the 50-200mm with the EX-25 ?   Now there is a combo that gives you excellent working distance and terrific IQ.  Sure it's big and heavy, but the zoom feature adds a whole lot of flexibility with respect to your working distance

IMO there are several options beyond the 50mm f/2 macro.

Peter