Why not fund an account that will pay out all the alimony payments on time, but you (OP) will be the beneficiary of any interest gains over the time the money is paid out? That would recover a very small part of the penalties.
Its being garnished from his wages so that is problematic...however a fund to reimburse himself for the paid out alimony would work. However...that doesn't solve the tax problem. I feel strongly that a
single lump sum distribution from a retirement account is NOT in his best interest.
Let me give an example. For the sake of the example lets say that the OP's 3000.00 a month is net rather than gross, and that he makes about 45k per year. Right now his federal tax bite is about the following: 45k - 6100.00 standard deduction, and 3900.00 personal exemption, minus 14400.00 in alimony for a taxable income of 20600.00 which would put him firmly in the 15% marginal tax bracket and would result in a federal tax bit of 2644.00.
If he takes a lump sum distribution and if he gets lucky and the IRS doesn't challenge that lump sum payment as alimony, he could end up only owing an addition 2640.00 in tax (the early withdrawal penalty). If he takes a lump sum distribution in one tax year, and the IRS challenges it that adds 26400.00 to his income, making his taxable income 47000.00. That makes a tax bite of 10959.00 (including the 10% penalty) with about 11,000 of that taxable income being in the 25% tax bracket.
Therefore, a single lump sum could cost him 7675.00. However, if he spreads the distributions over the three tax years involved, he will easily stay out of the 25% tax bracket, won't be subject to any IRS challenge and therefore he will reduce the potential cost of that distribution by a total of 2060.00 over those three tax years.
Please note that my figures do not take any state tax implications into consideration. Those, of course, could raise the cost.