I am writing it up. Just need to clear a couple of points and do some screenshots.
It will be published on my blog on
https://www.oceanwatcher.com/ and I will post a link here.
In the mean time, here is a Twitter-style version of the workflow
Write subtitles in your favourite word processor.
Format them with one empty line between blocks.
Import into Subtitle Edit
Do the timing
Save as XML+images
Import into Resolve and add to timeline.
There is more to it than this, including a couple of edits of the XML (will talk with the software author about that). But these are the major steps.
I have also found a open and free font that is very close to the one used by many tv channels for subtitling. This way, it will look very clean and professional.