If you want just one holding, you can buy VXUS and hold all non-US stocks in one ETF. VXUS consists of ~20% emerging markets and ~80% developed markets, costing 0.09%/year (expense ratio).
You could split that into VEA and VWO: 80% in VEA (0.05% expense ratio), 20% in VWO (0.12% expense ratio) for an average expense ratio of 0.064%. But it's probably not worth doing for the savings alone, since the savings compounded over 40% years adds up to 1% of assets.
There's also non-Vanguard ETFs (which are $0/trade at Vanguard) like IXUS (iShares).