I think Matties Ekholm is a more realistic target.
Some outside the box thinking. Two trades with Nashville, where the Devils retain 3.5 million of Subban's contract (38.89%) for the Predators. Works perfectly for the Devils for when Jack Hughes next contract will start, and Mattias Ekholm next contract would be. Works well for the Predators because they will have 7.25 million of extra salary cap space.
To NJD:
PK Subban
To Nashville:
Mike McLeod
Mirco Mueller
2019 34th overall pick
2020 1st round pick (top 3 protected)
THEN
To NJD:
Mattias Ekholm
To Nashville:
PK Subban (38.89% contract AAV retained)