You have another option and an alternative to using either Topaz Denoise AI or DXO Deep Prime, which can work with or without a tripod. M43 and the G9 in particular make it relatively simple to take multiple images in a burst, and subsequently stack & average in Photoshop to dramatically reduce noise.
Of course you do need to use Photoshop for this. There may be other software that can do the same, but I haven't heard of it.
I have Topaz Denoise which I use for pretty extreme cases like ISO3200 and above but it has a tendency to create defects of it's own so I prefer Darktable profiled denoise if I can do with ISO800-1000
And you don't need Photoshop for averaging out noise from multiple shots. This is what some HDR algorithms are able to do. It might be that they have some clever build-in NR system .
(edit: there seems to be a huge difference between HRD implementations and some might even increase noise. I've had excellent results for example when scanning 35mm slides with MFT camera and macro lens using HRD. Not only does this method capture details which are not visible otherwise but result has less noise at least when I use Darktable.)
Try feeding 3-5 shots with the same exposure to HDR or better yet use small exposure bracketing like 1/3 step to take advantage of increased dynamic range while you are at it.
Totally free Darktable has excellent HRD but I can't imagine how this module could be made any more complicated and confusing to use for users who are new to HRD.