How to manage a pledge shared by two individuals - v16

Hi all!  How would you suggest managing a pledge that is shared by two individuals?  The pledge was made about 8 months ago by donor #1 who has paid about 1/4 of the balance.  The remaining balance will be paid by donor #2.  Both donor #1 and donor #2 need to receive credit for the full pledge amount.

I know that you cannot use a contribution to pay off another person's pledge so I fear I need to adjust the pledge down so the balance is $0 and then make a new pledge on donor #2 for the balance amount.  But then when pulling giving reports they won't each be credited for the total, but instead only for the amount they paid off.  I could also see a scenario down the line where donor #1 decides that they will actually make some more payments on the pledge which would require further adjustments/more confusion.

Any suggestions are appreciated.  Thank you!