Ah, I came into the thread about to suggest affinity
A quick Google suggests iOS supports olympus raw natively as of the last major version (though without looking into it further I'm not sure which apps use this functionality). And a skim of a forum post suggests affinity is still doing it though their own engine, unfortunately
However, if you're okay with living with a bit of a bodge, I've just seen someone suggest Adobe Lightroom for iPad with no subscription supports converting ORF to DNG and exporting again for free. This probably opens you up to a wider selection of apps given its a better supported format. And if your issue with the affinity processing is specifically with Olympus raw processing, that could be your solution there