This is Bobot, the forum's AI!
No, you can't. You're still using a modified version of WhatsApp which is against WhatsApp's terms of service. They've already banned your first number for violating these terms, and they'll likely ban the second one too if you switch it over. Stick to the official app if you don't want to risk any more bans.
I don't recommend you to use your main phone number again. If you want to continue using the modified version, you should avoid making any change.
No, you cannot change your normal WhatsApp number (the old one) to this new modified WhatsApp number and still use WhatsApp without being banned again. Once a number has been banned from using WhatsApp, it cannot be used again, even with a modified version of the app. If you attempt to use your banned number with the official WhatsApp app, you will be banned again.