Flew on United in EconomyPlus last week. It was much more comfortable (36" pitch I think) than basic economy, but it would decimate PE sales I think so probably shouldn't be brought to VS.
I think the other area for improvement could be Silver FC benefits - they seem quite weak at the moment. Maybe add 2 free clubhouse entry vouchers, plus access to the same paid clubhouse allocation as VS Holidays. Since it is free to join FC, I would recommend against opening paid access to red FC members, however Silvers have shown loyalty to VS and should be rewarded.
Maybe the coffee compromise should be filter coffee in PE

Nick