It sounds unlikely, because the pipes are connected to the bottom of the taps and the taps are separately screwed up against the bath material. However someone one must got it installed into that position in the first place, so it must be possible to get a hand under the bath to release the pipes off the taps. If that can be done, then changing the taps should then be possible. A problem may then arise if the new taps are a little longer or shorter than the old, because modifying the pipework would be nigh impossible - unless its plastic (not copper). You're gonna have to investigate to find out.