If you get your camera modified, you certainly won't be ruining it for daytime use!

How accurately it will reproduce color will depend on how critical your needs are.

For snapshots, if you are not too picky, you can get by with just setting a custom white balance on a gray card for the illumination of the scene.

If you are more critical, in addition to the custom WB, you will want to also use a supplementary filter, either in front of the lens or in the camera body in front of the mirror, to take the place of the manufacturer's original filter.

Jerry