I rather play Galloway/Grant/Calderon (in that order - starter, backup, 3rd string) at PG next year and upgrade the wing positions with elite talent. I'd go into FA with the goal to add elite talent regardless of position.
With the Tri the entire flexibility is that you can bring in multiple players because the offense's positions all interchange. KP even brings the ball up sometimes and initiates. On the Lakers, Lamar Odom used to initiate. On the Bulls, Pippen.
What the team needs is more talent. This is a 35-45 win type of team talent wise. They need more talent.
Looking at the free agency list I'd look at
1-Kevin Durant (duh)
2-DeMar DeRozan
3-Nic Batum
4-Al Horford
5-Dwight Howard
6-Pau Gasol
Doubt most of those guys would sign, but any of those guys make more of an impact than Conley or Rondo. The Triangle needs a backcourt that can spread the floor. With Rondo/Conley, you won't likely get that. And Conley is used to an offense (As is Rondo) with a lot of the ball in his hands for long stretches of the game. You just don't see that with the Triangle teams that Phil has won championships with.