I'm not sure of the translation (especially whether inserting "someday" between "were" and "to" is correct syntax), so please feel free to correct me.

I've seen two translation of this verse, however I think that both are omitting some meaning:

from http://en.touhouwiki.net/wiki/Lyrics:_%E6%9D%B1%E6%96%B9%E5%A6%96%E3%80%85%E5%A4%A2_%E3%80%9Cthe_maximum_moving_about%E3%80%9C :

If my body may some day become someone's power

from http://kafkafuura.wordpress.com/2011/06/23/the-maximum-moving-about/ :

If this Body were to Become a Strength to Protect

Also, I love this song. ^ ^