I don't think that
Delegate is weak. If you just look at net effects this is a Smithy or Laboratory which seems a bit weakish for $5 but there is so much more going on: first of all there is the "draw first, get Actions later" aspect that is familiar from Avanto, Coin of the Realm and Villagers and that is also pretty strong.
Second, while you often commit to generate draw power from either Village + Smithy variant or Lab variant you sometimes also mix them together and if you get this deal via one card that is even better.
Third, Smithy is basically like Village or Throne Room: you don't mind paying $1 more even if the cherry on top is pretty small.
If Delegate were the mirror of Stables it would be too weak for $5 (but perhaps also too good for $4).
Unlike Stables, or rather the hypothetical ActionStables, this has the advantage of drawing before you discard (which, if we take a starting hand as benchmark, increase the number of cards you select from by 50%).
If you make the discarding mandatory this becomes a "mere" Stables variant and ceases to be what it is: a flexible card that can be used for terminal as well as non-terminal draw and that increases your engine consistency quite a bit.
tl;dr: Delegate is a great card, don't change it.
Not sure Loyal subjects needs to have that special on-trash.
Most def. A mere cantrip is too bland and this allows many Fortress tricks without becoming as crazy as Fortress (only one copy; landing in the discard pile).