The crew has captured and placed in stasis a Dark Force user, and are afraid that his "Mistress" is going to come looking for him. In the meantime, they are under the theory that they can store him in a place strong in the light side of the Force to mask his presence, like Yoda hiding in a dark side site, until they decide how to deal with him (he's the brother of one of the crew, so execution is out). It sounds like a decent plan to me, how about you? Probably going to suggest Albacas Ruins from Nexus of Power, or create someplace new and have a few encounters there.

Should work. How well depends in how "interesting" you want to make it for them.

Alternatively you could allow Force-sensitive PCs to use their Discipline to resist the master's Seek checks, together with Suppress if any of them have that power.