A surviving Force Z could slow the fall of the Dutch East Indies

Would Force Z surviving in 1941 substantially delay the fall of the Dutch East Indies?

Yes. It could create a stronger Allied fleet and force a major Japanese response, though the eventual fleet battle would remain decisive.

Surviving capital ships provide a command center that could draw in Saratoga, British carriers, and more coherent Allied naval cooperation. Their presence also complicates Japanese troop movements and may extend the defense of Singapore. Japan would likely send major capital ships south, while the Dutch East Indies holds out longer. The outcome still depends on whether the resulting fleet battle is won or lost.