This might be doable.
If you removed just one row of seats in the front cabin section, the remaining seats would have a pitch of about 37-38" (slightly better than E+). DL would only lose 6 revenue seats and the plane would still have 193 seats total.
Anyone in this front section would board with Zone 1, so they'd have "priority boarding."
I don't see a real demand for Channel 9 type stuff....Song has plenty of other things to keep you entertained.
You could even take it one step further and allow people in this front cabin to have one "food for purchase item" for free and maybe free booze.
The cabin would be available to Medallions and those on full Y fares at time of booking. Of course, you'd still have the dreaded middle seat problem.
I guess you could call it the Song Plus cabin.