Font creation/editing software is specifically designed to take glyphs, in vector form and generate working font files. Allowing the creator to set options such as default letter spacing, tracking, etc.
If your SVG glyphs are vector, all you need do is use actual font creation software, not "icon collection" software.
CreativeBloq has an article ...
You can copy/paste into Illustrator a list of all available characters (this list should do it) and than apply the desired font (ex: Font Awesome). You could use the list from that link to copy/paste it to excel to extract only the column with the characters and than copy/paste it to Illustrator.