Adding 2 diacritics to the Latin glyph set?

Hi there, I'm wondering if there's any possibility of adding the following 2 diacritics to the [Latin Plus glyph set](https://github.com/googlefonts/gftools/blob/master/Lib/gftools/encodings/GF%20Glyph%20Sets/GF-latin-plus_unique-glyphs.nam):

```
0x030D ̍ COMBINING VERTICAL LINE ABOVE
0x0358 ͘ COMBINING DOT ABOVE RIGHT
```

In principle, these two should be fairly straightforward. Most fonts already have glyphs with contours that can simply be reused at these 2 codepoints. Any plain vertical line component can be re-purposed for `0x030D`, and any standard dot (e.g., `0x0307 COMBINING DOT ABOVE`) can simply be re-used for `0x0358`.

Also, I'm not sure which set this glyph would belong in:

```
0x207F ⁿ SUPERSCRIPT LATIN SMALL LETTER N
```

These 3 glyphs would add support for [Taiwanese written in Latin script](https://en.wikipedia.org/wiki/Pe%CC%8Dh-%C5%8De-j%C4%AB). (A different popular romanization requires only `0x030D`, but that romanization is typically used for phonetic reference only, while the script linked here is used a native orthographic alternative to CJK characters.)

Additional information, not sure if relevant:

- `0x030D` uses the normal "top" accent position above alphabetic characters (specifically the set `a e i m n o u`, lower and upper, but most fonts already cover `A-Za-z`)
- `0x0358` is positioned at the top right corner of `o` (and optionally `e i u`), lower and upper