I believe the starting lineup works because we now have only 2 players who are trying to be the number one option, with OG and DDV playing a support role, while Brunson and Randle taking turns being the main option. And iHart being the anchor, doing the dirty work.
For the bench, we need to see the same balance. I agree that trading for Murray, and just telling him (or any other skilled player) to come off the bench, would be a bad idea. You have to sell a player on that role, before the trade. Be upfront about it.
That would still be hard to do, but possible if we start moving up the East. Its been a brutal stretch for the Knicks. A strong run into the all-star break (and the trade deadline) and maybe a player who might not normally be open to coming off the bench, might be OK with it, if the Knicks look like they're close to contending.
We still have a tough schedule going into the all-star break. If we have a good record in spite of the tough schedule, that would be a good way to recruit a replacement for IQ. Remind them that they werent willing to pay IQ for a bench role, but they're willing to pay them.