The answer to your question lies in the terms of the specific plan to which you belong. Some allow for lump sum payouts in exigent circumstances. Others allow borrowing against your money in various amounts. You need to get the terms of your pension plan and scour it for what you are looking for. For an hour or less of their time you could have an attorney do that review for you, so that you do not miss something in the legalese.
Good luck to you.
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If your former employer's plan does not offer a lump sum payout as a benefit option then there is not a way to change the rules to make an exception for you. You need to look at the plan rules and determine whether the plan offers a lump sum option.