I just discovered that Font Squirrel has an online tool that lets you create a font file that is a subset of an existing font. You can choose by Unicode block and even by the letter. Why does this matter? I find that any font that has all the Pāli letters needed will tend to have, understandably, many, many other letters as well. If you are making an app and want to include a font this can make a huge difference.
For example, I just created a Pali subset for Fira Sans. To include regular, italic and bold, the font size would have been ~1.2mb. Just the Pali letters needed? .1MB.
Here are some screenshots. You want to choose expert mode:
