You can go even lower with the resistors. I looked at the datasheet for the WT32i, but didn't really find any good info about current draw. Other than that everything there is in micro-amps. So it probably draws a LOT less than 1mA.

So you could safely go down to 1.2K (1200 ohms) per resistor, and most likely even 1K:1K without harming anything -- remember the datasheet numbers for the empeg DSP suggest 750:750 ohms as the absolute limit, so there is some headroom there.