Spring is here and that means the workaround setup changes to manual focus entirely: Nikkor 28/2.8 AIS, Canon FD 50/3.5 Macro (or Konica 57/1.4) and Canon FD 135/2.8. All old lenses become close-up lenses with micro 4/3 (because of the crop factor). Manual focusing is easy and preferable for macro anyway, they are built very well to withstand my everyday commute trips and the main problem with old lenses (chromatic aberrations) is usually not applicable for close-ups.
Nikkor 28/2.8 AIS is actually my most expensive MF lens (at $110), it's sharp and focuses close at 20cm. I believe specs have it at 1:4 magnification, which pretty much makes it close to what 50mm 1:2 macro lenses are for the full frame. It's not that fast as a normal lens on m43, but plenty fast as a closeup. Bokeh may not be the smoothest, but it's rendered very nicely nevertheless:
Macro lens is exactly where mirrorless systems saves me some $, it makes every sense to use an MF lens. I picked a Canon FDn 50/3.5 because long telephoto macro is not really my thing, plus it's small, light, sharp and cheap. Compared to Olympus OM 50/3.5 macro Canon was sharper albeit a bit larger.
Konica 57/1.4 has the best bokeh of my lenses adapted to micro 4/3 and it focuses at 45cm, which is typical for a normal lens but since it's equivalent to about 114mm on micro 4/3 it becomes a pretty nice close-up lens.
I got Canon FDn 135/2.8 on ebay for $35 (it has a tiny scratch on the 2nd element) just because it was so cheap. It turned out to an excellent lens - sharp, with nice contrast and bokeh, much better than Canon EF 135/2.8 that I used to have. Although intended to be a telephoto portrait it's useful as a close-up lens for things out of reach.