forcing even eighth notes in a single bar

[Kieren MacMillan]

[ v. 2.9.15 ]

Hello, all --

I've got a bar of vocal (choral) text which ends up looking a bit  
uneven:

Is there any easy way to force Lilypond to use "exact eighth notes"  
for just this measure?
From what I've seen in the docs, I'm worried that most proportional  
spacing commands are score-wide...

For what it's worth, I'm happy to manually tweak the lyric syllables  
to fit to the note alignment...

Thanks,
Kieren.