New IRS Prop Regs on Accident & Health Insurance

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Assume Corp. X buys a long-term disability contract for its 401(k) plan, P, to provide disability benefits payable to the plan accounts of those participants becoming disabled, equal to the contributions that were made when the employees were actively employed. According to the new proposed regulations, the employer's payment of the premium would be treated as a plan distribution to the participant taxable under Code Section 402(a). If the benefits under the contract are payable to the plan and allocable to the participant's account, the proposed regs provide that the amounts are excludable from the participant's gross income under Code Section 104(a)(3) which is recontributed by the participant to the plan as an employee after-tax contribution. My question is, how is the distribution of the disability benefit portion of the participant's account balance treated for tax purposes: (1) is the portion excludable under Code Section 104(a)(3)? or (2) is the amount of the distribution subject to tax under Code Sections 72 and 402, with the amount of the deemed employee after-tax contributions treated as a nontaxable return of basis?