Thank you! this is what I wanted to suggest and I've used this technique myself as well a few times. The thing to watch out for is overloading a single HTML tool with many big images, since this can slow the editing down a lot or make it difficult. But as long as you keep the size per tool under control, there is not much risk in using this method. Indeed, I would recommend using JPG for bigger images, otherwise also loading times may become a problem.
The RC currently does not have a way of generating static links for media, the reason for this also has to do with that we have to control access to media: media that is used in a private exposition should not be visible through a static link. Also having a static link to a media file could be abused to use the RC as a file hosting service (the RC aims to be a platform for the contextualization of artistic research results). However, we are looking into making it possible to "embed" media within HTML and text tools, a bit similar to how media in the text-based editor works. So embedding inline images should become easier in the future. In general inserting images inline with a text will be a lot easier once we have the 1d-editor for graphic expositions becomes available. We expect this to be released later this year, so stay tuned!