I have 7.03 and the last time when I run it with DCG (half a year ago) everything worked just fine.

I use head tracking and a hotas, and I've never felt any need for a FOV mod. 'Toggle gunsight' + 'gunsight view' is more than enough for me; when I'm in firing disctance (<300) I even have to switch back to 'normal view' to avoid target fixation and to regain SA.

I guess there is no plan to bring CUP to 4.13, right?  It's been several months, I don't see any new developments.

I see little chance for that. Modders say 4.13 broke back compatibility, meaning that modded planes made for 4.12 do not work any more without re-coding them individually. Revising and re-coding 300+ planes would be too much work.