Surely the short term solution is you keep a simple SD simulcast (without regional news, so one stream) for no more than a year. Keeping the legacy SD system around to avoid the costs associated with switching everything to HD must ony be burning money in the long run.
The BBC have no problem in finding the costs to upgrade the iPlayer seemingly every year or so - I know it's easy to say on the outside but I just don't accept it as an excuse now. Ten years ago it may have been, but the BBC and Freeview have had a decade to sort this out now and seemingly we're no further forward than we were then. All that's largely happened is the squeezing in of more and more subquality SD channels.
If only that upgrading Coding and Mux was as easy as working with Microservices and ready & proven Cloud technology .... like Iplayer .which is why "Regions in HD" may be offered (as the BBC have stated) on the Iplayer Platform - its a lot cheaper ...
But although the technology is moving to Code and Mux (and playout for that matter) from the cloud - a major change -
for both the suppliers either side of Code and Mux .... .
I'm sure that an appropriate telco and cloud provdier would be overjoyed to have about 60Gbit/sec (if ST2022-6 presentaion tsion
or 45 Gbit/sec is ST2110 presentation to the cloud up and only about 1 G down
But there is a lot of code needed to replicate the base band routing and switching (for buddying etc) and monitoring
I don't think anyone has done that in the cloud yet !!!
Freeveiw has very little to do with anything other than promoting the platform ....
and if a chanel wansts to be on the platfrom it just needs OFCOM documents and do a deal with one of the Mux operators - I'm sure that either itv or Arqiva would be very pleased to offer better pictures for a price ..... and a means of getting your EPG
data to DUK .