It might be stating the obvious here, but *if* the plan sponsor determines that a restorative payment is warranted (under the guidance given by my esteemed professional colleagues above), the the plan sponsor is essentially *admitting* (at least the serious possibility) of a fiduciary breach and that breach essentially entails the selection of the SVF fund in the initial instance (with the possibility of an MVA.) While a restorative payment may solve the back end issue of a MVA, it leaves the fiduciary exposed for any other damages that an enterprising plaintiff's counsel may see for the entirety of the fund being in the plan.
We never recommend a restorative payment (which is iffy in any event), and usually advise that the client seek an alternative (installment payments, a "put" or the like,) If the contract is benefit responsive, participant's generally will suffer no loss. Inconvenient, yup, but we do it all the time (both with respect to incoming business, and outgoing business using our SVF).