Subscription Confirmation Email sending as Gift Email

OK so I'm pretty up to speed with how SP scheduling works but I've hit a snag with subscriptions. 

Run a yoga business that allows people to book group or 121 sessions which all works great. What I want to do is allow people to buy a subscription to help spread the cost of their 121 sessions (so for example, buy 2 hours of 121 sessions to be taken / paid for over 3 months).

I've set this up in SP. No issues there... but the issue is, for it to work with appointments I have to tick the below

And then choose the appointments its applicable to. All good.

However, the confirmation email then becomes a Package / Gift Certificate order, which is a template that I use for gift vouchers and not for subscriptions. I want to be able to use the "Subscription Paid" client email so I can customise it towards subscriptions.

Any ideas how to fix?

Thanks

Anyone?