Able to Delete Draft Credit Memo in PPM?

Credit Memos were incorrectly/accidentally created in PPM due to a user backdate amending the contract. We want to delete the draft Credit Memos so the original invoices are unimpacted and remain as they were.

The Actions > Delete option is grayed out (screenshot) and per this Idea, it appears it's not possible to delete a draft Credit Memo.

Workaround: Push through the CMs to AR, then recreate the original invoices

Question: Are there any other alternate solutions other than the above workaround?