An answer might be to stop contributing to the Roth TSP, but instead contribute to the TSP. Take the tax savings you get by doing that and open a regular taxable account and invest in a total international fund in it. Adjust asset allocation in your other accounts appropriately.
If you are asking "Is it OK to have EAFE-only International or do I really need EAFE+emerging+Canada+small-caps?", then I can say that the latter is preferred, but it is OK to just go with the former. After all, that's what many people did for years and years.
It's all about market timing, uh, I mean rebalancing, uh, I mean opportunistic rebalancing, uh, I mean short-term opportunistic rebalancing due to a short-term change in one's asset allocation.