Faculty leaving to get a second degree, see training, etc. Is it heard of in Academia?
The most common way I have seen this occur is through collaboration.

Rather than starting from scratch learning like a student in another professor's lab, the faculty member would start a collaboration with someone at the same or another institution. As part of this collaboration, it is possible to trade and learn skills from each other.

Especially in the situation you describe, it sounds like you have skills that are directly useful to a potential collaborator who has the wet biology background without the computational side, and such a collaboration could increase rather than decrease your productivity.