Real answer:

Depends on who manages your 401k. Some servicers do allow 'custom' or otherwise 'alternative' management options, with some allowing you to focus on specific companies or industries.

Others might take your call at least and if you raise enough of a stink you might get shoved into an alternative plan out of spite, but that's what you want, so you win.

My split is currently 10% traditional "retirement target date" 20% small cap US and 70% International Index. All Vanguard. There are also emerging market and more granular international funds. Talk to your servicer.