Converting formats is a good idea. I haven't really played around with ebook formats that much as I have usually either just bought something through kindle or read fan translations of WNs. I really have no idea why I ended up with mobi files for a handful of the early Konosuba novels. I am going to try that out and see how it goes.

As for Shosetsu, I just installed it and have been experimenting with different sources after figuring out the extensions repo thing. I see what you mean now about taking some time to get it set up. I am going to tinker around with this in the background since LNReader similarly took me a long time to get set up and (so far) is still working. The main thing I was worried about is that half the extensions in LNReader seem to be nonfunctional and unmaintained. However, that also seems to be the case for the handful I tried out in Shosetsu as well.