Increasing NAME_SIZE from 1024

I have to load the tileset into Cesium3DTileset and the tileset is in the private bucket. To access the objects in the private bucket, I am using CloudFront Signed Cookie (Since Cesium3DTileset needs to access other helper files). However, since there is no way to send Cookie, I am sending it as a query parameter attached to URL. But this makes the URL very long hence causing FName's 1023 max length exceeded. Got 1405 characters excluding null-terminator.

So, I wonder if there is a better/alternative way to achieve my goal. One way I can think of is increasing the NAME_SIZE from 1024 to some higher value. But I am not sure how to do that or if that is even possible.