The only way to do that is via custom coding, and it’ll be different, depending on which theme you’re using. I couldn’t really tell you how to do this, without being able to play around with the coding myself first. This is definitely doable though.
The following code will unify the price section to a single line and ensure consistent font sizes on mobile. I’ve attempted to adjust the ‘AUD’ part, but it seems to conflict with the existing software. Of course, with some effort, it can be done.
Add these between the tags. Or simply add the contents of the section to your CSS and clear the caches. I’ve tested it on Google Chrome and it worked seamlessly. I recommend checking for any conflicts with other areas after testing.