Or do what everybody has been talking about all year, start White & Murray at the guards. It wouldn't even be necessary to designate which is the point guard. They both know the offense. They could call it themselves, on the floor, for who takes the point, depending on the opposition and matchups. Play them both as combo guards. Pop would have a screeching fit, tho. But if White and Murray had been playing together all season they'd probably be a pretty good tandem by now. Oh well.
Guards: White & Murray, or vice versa.
SF: DDR.
PF: Lyles (for rebounding).
PF/C: LMA
Bench.
PG: Walker
SG: Mills
Forwards: Gay & Metu
Center: Poeltl
The high energy level of Mills goes better with Walker. Find out if they can feed off each other, while Mills is having one of his better years.
It is seriously way past the time to see if Metu can play. Enough of the half-assed Spurs excuse for "development." Give Metu some run in the rotation. If it works, good, or if not, trade him or let him go.
As for trades, the Spurs are unlikely to find any, except heavily at their own expense.