I’m sorry, that is not a valid solution to this problem. Using x2 draft orders means the subsequent orders are not at all connected to the original one, fake items need to be created for the instalment payments.
This is totally unacceptable with Shopify Plus. The reality is that Shopify at it’s core is really a very basic, low end ecommerce platform that is perfect for entry level stores. The ‘promise’ of Shopify Plus is that it’s better suited to larger stores, but it’s really just the same basic system with a much higher price tag. The only real benefit is lower merchant fees, the so called better reporting and other features are a joke.