The compensation contemplated by this article¹ may at any time be commuted by the board, at its then value when discounted at five per centum interest, with annual rests, upon application of either party, with due notice to the other, if it appear that such commutation will be for the best interest of the employe or the dependents of the deceased employe, and that it will avoid undue expense or undue hardship to either party, or that such employe or dependent has removed or is about to remove from the United States, or that the employer has sold or otherwise disposed of the whole or the greater part of his business or assets: Provided, however, That unless the employer agrees to make such commutation, the board may require the employe or the dependents of the deceased employe to furnish proper indemnity safeguarding the employer's rights. Nothing in this section shall prohibit, restrict or impair the right of the parties to enter into a compromise and release by stipulation in accord with section 449.²