Switching Payment Gateways In Pro Sites


I have been using pro Sites with the Pay Pal gateway for over 3 years. I have about 200 paying customers sites. I am currently having issues with Pro Sites with payments not going through and not activating the websites properly. I have another ticket on support about this.

I was thinking about testing out the Stipe gateway instead of PayPal because it is working on other install.

Is it possible to switch gateways on an existing install and make Stripe the primary? How will this effect the subscriptions of my existing users on the PayPal payment gateway?