- Edited
I did contact the support of the the kodi remote app Yatse, if it would be possible to purchase the pro version without using the Play Store. Here is the answer:
You can purchase the pro version via paypal from https://yatse.tv/yatse-payment-troubleshooting it's tied to an email account present in the OS / settings of your device and does not need to be google one. The Pro version will only work on Android devices where this email is registered as an Android account.
Since there is no email account connected with the OS, I think it is not possible to go this way, is it?