I have the same issue with you and still font get the solution.
my alternate font appeared in U+F000. Can I change the code into U+E000 so that it can be easier to find in character map?
How I can change the code for PUA?
By default, any unassigned glyph is part of PUAs from U+E900 upwards. To rename an existing glyph to a PUA, you can enter the actual character
or rename it like