Wa Alaikum Al Salam WRWB,
How are you and how is your life?
I am so happy that you are asking great questions.
In my point taking part, accepting of the gifts for any non Muslims festivals (Eids) is equal to accepting their religoun as a right path.
There are many Ahadith and Scholars saying, avoiding Muslims to be away from them and their Eids.
Bellow link is saying some of the points you mentioned, especially in 2nd post of bellow link by the name of: Ruling on Christmas & New Year
The History of Christmas & Related issues