Hi,
Even if you can include the view content in the vendor registration ; it will not work because the controller can just perform one single action.
More than that, in Joomla you can't include views from another "context" like that (vendormarket / productmarket), it requires specific code (than getLayout from the HikaShop/HikaMarket core allow you to do).
But just as I said, even if you include the view, the controller will not perform the product save. It would require some custom development (and a custom plugin) to have your own controller and your own algorithms.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.