More granular options for character variants [ cv10 (i and l alternates ; Neon, Argon, Xenon, Radon) and cv11 (j, f, r and t alternates ; Neon, Argon) ]

Hi, I wanted there to be more granular options for some character variants:
Currently, two cv's control 6 Latin letters:
- `cv10` (l i alternates ; Neon, Argon, Xenon, Radon)
- `cv11` (j f r t alternates ; Neon, Argon)
I want this to be changed so that character variants for each of the letter f, i, j, l, r and t are toggled by different cv's such as:
- `cv14` (f alternates)
- `cv15` (i alternates)
- `cv16` (j alternates)
- `cv17` (l alternates)
- `cv18` (r alternates)
- `cv19` (t alternates)

Thank you very much in advance for your consideration.

P.S. The scope of this issue covers that of this issue: https://github.com/githubnext/monaspace/issues/351