Let's talk about few simple things.
The Cup I think it's the most easy trophy to win (I mean for an experience manager or an active member of the forum)

* maybe there is an exception for higher lv teams, where there are few managers at their lv.
The only thing you need is to finish (and start) the season with 14 low q players.
maybe 2-3 0T academy players and the rest 3* players, oldies or free agents.

The problem comes when you have a good team, with players you don't want to loose.
The other thing is that the target, the holy grail of a (trophy hunter) manager is the treble.
But why a manager must destroy his team or trying manipulating quality methods for that ?

-So, why not to play in a competitive league (now with the new draw system)
- in a competitive (as always) CH.L.
- and in a Cup with q draw but with teams only from the level of the manager ?

If win those three competition (and it's not easy) , the treble is yours.