I like your GFCI solutions, the look of the NEMA oulets are nicer then the typical European outlets, but maybe not as saferegarding the risk of touching the metal parts of the plugs that may visible when the plug just is almoast plugged fully in. The totally safest outles may be a third standard, the new South African std seems to be great. Adapters are generally a risk, so keeping the national standards will still be the safest.
My conclusion of this thread will be that Europeans moving to USA may change their plugs, and get 240V outlets for equipment they want to keep, but the most will probably be best to replace with local standard units.
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