Hi @James Singleton thank you for your post. At this time it doesn't look like there are plans for the i3S reader to be added to FME, if the business case is strong enough and the idea that you linked to receives enough traction the dev team will consider implementing this reader format. One thing to note is as i3s is more of a presentation format it may be better to read in the source data into FME using a different if possible.
Hope this helps answer your question :)
HI @daraghatsafe
I just wondering if we still need to wait to have a feature to read the SLPK format in FME.
As using 3D data packages are incredibly increasing to be used in analysis in the market, that would be great if the FME users can have this opportunity to use such a feature in FME as well.