Are the lenses Auto Focus? If not you could get one of those adapter tubes for OM to M43 like this or this.

But I know using the Viltrox or Metabones have glass that can help with the crop factor or whatever else you may have to deal with. The adapter tubes are just hollow.

I wouldn't see a reason stacking them wouldn't work, but you may be just adding space between your lens and your sensor and maybe a host of other problems... or no problems at all.

I used one of the hollow adapters for some old 1970's Canon FD mount with my GH5. They were amazing. But that 2x crop on the Micro four Thirds sensor can be quite alot, which is where the glass in the metabones or viltrox comes in handy. I hope all works out well, sounds like you're about to have a lot of fun.