Purchase issue for users in China

[mickeylili]

I am from China and I downloaded Poweramp trial version recently. But when I was trying to buy it, I was required to fill in my phone Google account and I saw the note on the purchase page:

NOTE: Poweramp license is per Google Account. Poweramp Full Version can’t be used on device without Google Account registered on it.

But the problem is that all stuff related to Google service has been removed from every legitimate handset in China. Since I can't even add a Google account for my phone, how can I activate the full version if I buy it? I really like this app and I appreciate the author. Could you please tell me what I can do? Thanks!