That's what a favorites list is for. I have never seen SD-only content on the BTN alts, so it's safe to edit them out. There is little SD-only content on the alts, most of it on FCS, MASN2, CSN(MA)+, FSWIS, FSOK, and Altitude-alt.
And this method would allow for FSMW and FSNORTH to have dedicated PLUS channels so that hockey and misplaced Cardinals games aren't all over the guide.
628 NESN HD
628 NESN
629 NESN+
629-1 NESN+HD
Takes up no more space and causes no more clutter than
628 NESN HD
628 NESN SD
628-1 NESN+HD
628-1 NESN+
Now, dedicated +'s can come to those that need them:
668 FSNORHD
668 FSNOR
668-1 FSNOR+HD
668-1 FSNOR+
then FSWIS can stay where it is and everybody has a channel .
Now, all alts have dashes, making it more obvious that it's an alternate channel. I just think it's easier. To each their own, I suppose!