Firstly, I do not have Word 2016 or the other software packages that you mention. Also I am using FontCreator 8. I am using Windiws 10.
So I cannot directly try the problem here.
However, it might be that I can help with the underlying problem and you could if you wish then try the suggestion and test whether it works.
I never liked Symbol fonts. I like fonts with symbols in them, but not what are termed Symbol fonts.
As I understand it, Symbol fonts amount to a solution to a problem.
In an ordinary font - sometimes called a Unicode font - a particular glyph is associated with a particular code point.
For example, there is a code point (a whole number, often expressed in hexadecimal notation) for a letter E and the cell for that code point will have an image of a letter E. Maybe with serifs, maybe without serifs, maybe italic, of whatever design is desired, like pop, antique, ornate.
In a Unicode font, if one wants a symbol, then there are two ways to go. If the symbol is encoded in Unicode, then use that code point. If the symbol is not encoded in Unicode, then use the Private Use Area.
For example, a Comet is encoded in regular Unicode, a symbol to mean “Best regards,” is not encoded in regular Unicode.
That is the way to do it today.
Now suppose however that one wants a font whereby one can type an E on the keyboard and on the screen appears a picture of, say, a daffodil.
There is nothing to stop anyone making such a non-standard font. Such fonts can be useful in some situations.
But that is non-standard!
This is where a Symbol font comes in.
In the Symbol font, internally to the font the glyphs are mapped to some of the code points within the Unicode Private Use Area, yet in use the glyphs are accessed by typing a key on the keyboard as if the glyphs were mapped to the code points of the keyboard characters.
The question was asked.
So what I am asking is: is there anything I can do to modify those higher level symbols on this font so they appear in this latest version of Word?
It seems to me that the best approach would be to start a new font that is not a symbol font, and then copy the glyphs but not the code points from the Symbol font to the new font, placing each glyph either somewhere in the regular Unicode character map or in the Private Use Area as appropriate depending upon whether that glyph represents a character that is encoded in regular Unicode.
There is a facility to convert from a Symbol font to a Unicode font. It is accessed from Tools Convert Font.
Now I have not tried that and maybe that would work, but my instinct is to start a new font and copy the glyphs yet not the code points and then you know that you have started yourself.
It is not always clear what level of knowledge and which particular items of knowledge someoe who asks a question has.
So if you do not know about the Private Use Area please say so and then I and maybe others can try to answer your questions. However, as it is possible that you are already knowledgable about the Private Use Area I shall not write about the details of it in this particular post.
I hope that this helps.
William