Hi,
At this time, our PayPal recurring plugin allow to pay in many times to for example 33.33% three times or 50% two times.
But for your needs, you will have to make a plugin which will create two orders when checking out, one at 30% and another one at 70%. The first one which will be the current one, and the other one with the created order status.
In the configuration > main > order enable the option to pay later.
Here is the documentation for the developer:
hikashop.com/support/support/documentati...r-documentation.html