This really isn’t a solution and shouldn’t be marked as such.
Development stores are supposed to emulate the functionality of managed/live stores. This restriction makes development stores distinctly different from managed stores and prevents developers from creating integrations that follow merchant workflows that utilise draft orders. The restriction seemingly flies in the face of Shopify being an open platform where developers can create third party integrations.
The real and only solution to this issue is to rebuild the development store every time you reach the draft order hard limit set by Shopify.