It's a shame you haven't been able to achieve what you wanted with Scribus. I'm also surprised you've had no replies to your other post yet. The forum members are usually pretty quick with their answers.
I've had a look at your other post but unfortunately I don't know much about either SVGs or HTML so I don't really understand that question.
However, and this might be a moot point if you've already moved away from Scribus, did you try exporting your SVG (using Inkscape, for example) to an EPS and putting that EPS in an image frame?
You could, perhaps, enlarge the SVG, then export it (I think you can set a DPI for the preview image), then put it into an image frame, then use the scaling tools (in the Properties palette) to get the image how you want it.
This might not be a precise or "correct" way to do this sort of thing but I've found that, for my very limited needs, I can achieve pretty much what I want with a bit of a play around with various options. (Bear in mind that, I think, Scribus only shows the EPS preview on screen so you might need to do a little experimentation to get what you're after.)
Anyway, I hope you keep looking in on Scribus to see how things are progressing. You might find it meets your future needs sometime soon.
Garry.
P.S. I haven't put this reply in with your other post in case what I've suggested is a load of rubbish and other people get confused by it.