Change XML sitemap

Hello,

We have customdomain[dot]com where we host our website and customdomain.ghost[dot]com where we host a blog.
We forward all traffic from customdomain[dot]com/blog to customdomain.ghost[dot]com/blog.

We want to update the XML sitemap on Ghost, from customdomain.ghost.com/blog* to customdomain.com/blog*

Is there any other way to achieve this besides using the Ghost subdirectory.

Thank you.

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Have you ever found a solution to this?