Challenge: 819-line TV more widely accepted

Some may know, or not, of th 819-line TV systems adopted in the likes of France and Italy, an early form of high-definition TV system almost if not quite coparible to the modern standard, at least with the System E sort which suffered from the fact that it ocupied a VHF channel bandwidth of 14MHz (as opposed to System F used in neighbouring coutries using only 7Mhz bandwidth). Of course this does mean that there are bound to be fewer possible stations broadcast on the available bandwidth and it is probably less than practical for analogue terrestrial TV- the standard even being abandoned in France in the '80s at the latest in favour of some form of the more common 625-line standard.

So the challenge is: make 819-line standards somehow more widely accepted, or introduced more widely as an early high-definition standard, if only on cable or satellite. How posssible is it?
 
The problem with the French System E is that it consumed tons of bandwidth just for the picture - whilst the picture was probably phenomenal, it constituted an unnecessary waste of good spectrum (try getting stereo sound into that, even when there was no room, let alone colour TV). The Belgian/Italian System F would probably be a better choice, IMO.

I could actually see it being used by some South American countries (especially Argentina, Uruguay, and Brazil) where the mains voltage is at least 220V and/or 50Hz (remember that the early choice of television standards was based on mains voltage). That would mean that PAL-M (used in Brazil and Paraguay) and PAL-N (used in Argentina, Uruguay, and [IIRC] also in Paraguay) would not be invented in OTL. The trouble, however, would be with UHF - South America, like North America, uses a common set of television channels for UHF, unless the European set of UHF channels was adopted. PAL-F or SECAM-F with NICAM, anyone?
 
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