That is a TERRIBLE idea.
Yeah, FUNi redid the music for Dragonball Z. It sucked.
I bought the first US release of Bubblegum Crisis. They redubbed all of the songs and they SUCKED, compared to the original Japanese songs. I like the originals so much that I bought a 3 CD OST set. They still have a place in my iPod. Later on, ironically, ADV remastered the series and incorporated the original music with the english redubbed dialog. I have that version, as well. I like it better than the original M2K boxed set.
No, I want the original music.
When you redub, you often have totally change the lyrics in order to achieve the same rhyme scheme and meter. That usually means it is now a totally DIFFERENT song from the original.
I would be appalled of anyone tried to redub the song Maids Sanjou from Soredemo Machi wa Mawatteiru. It would absolutely RUIN it.
If you can’t understand the lyrics, just try www.animelyrics.com and get a set of translations. Their list is rather large.