I have a nearly identical plan to do that at Schwab.
I currently have about 2K of paper losses in Schwab's emerging market ETF: SCHE.
I need to wait until Sept 17 to avoid the wash sale rule (I rebalanced last month). Then I plan on selling SCHE and buying the same dollar equivalent of the Ishares EEM ETF; different symbol, different per-share pricing, identical chart pattern.
I'm not a tax expert, but if the IRS considers this the same equity they can damn well catch me themselves. ;)