Hi, we suggest that you can custom your theme and make these the initial kit and refills shown on the same product site. The customer can adds the initial kit into the cart as usual. Also can see the refills on the same page and add the refill to the cart as subscription. The only thing is you need to contact with the subscription app support and ask them whether can do the customization depending on your customized theme.
Or you can wait for the new feature, add subscriptions on the post purchase site. But this is still developing and will published soon.
Hope this can help.
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