(a) The Secretary on his own motion or after having received the petition of an administrator may prescribe an alternative method for satisfying any requirement of this part with respect to any pension plan, or class of pension plans, subject to such requirement if he determines—
(2) that the application of such requirement of this part would—
increase the costs to the plan, or
An alternative method may be prescribed under subsection (a) by regulation or otherwise. If an alternative method is prescribed other than by regulation, the Secretary shall provide notice and an opportunity for interested persons to present their views, and shall publish in the Federal Register the provisions of such alternative method.