Hello Henry,
Welcome to Microsoft Community.
After reading everything you've posted, I'm guessing you have got one of these two keyboards for the Surface Pro 11:
And a keyboard with a charging slot is generally like this:
If you're asking if there's an accessory that can charge the Slim Pen 2 separately, there is:
How to charge your Surface Slim Pen - Microsoft Support****
However, I searched the official Microsoft store page in Ecuador, and it seems that this accessory is not listed in your country:
Microsoft: IA, nube, productividad, informática, juegos y aplicaciones
This link is written in Spanish.
So my advice is, if you're looking to charge your Slim Pen 2, you might want to check Amazon to see if there's a third-party seller that sells this charger.
Of course, I can also share with you the official website of the United States, and you can talk with the sales representative about whether you can buy internationally:
Surface Slim Pen Charger - Microsoft Store
Best Regards,
Mitchell | Microsoft Community Support Specialist