Originally Posted by kovidgoyal
Actually you can decompile the LRF into LRS, which is a simple XML file and then bump up the font sizes in that and then re-compile
Unfortunately, I've only written lrf2lrs so far, not lrs2lrf
While it would be great to have lrs2lrf the one you did is probably enough since there are other tools like BookDesigner that might be coerced into reading an LRS file. Has anyone tried that? Of course this is always Librie code somewhere.