Could you get people to use the NATO phonetic alphabet for the spelling part? I suppose a challenge is that many people don't know the whole thing, even if they're aware it exists.
NATO phonetic is to be understandable over a noisy radio channel, if you want just distinct sounds then Talon Voice users settled on shorter ones easier to use all the time:
air a
bat b
cap c
drum d
each e
fine f
gust g
harp h
sit i
jury j
crunch k
look l
made m
near n
odd o
pit p
quench q
red r
sun s
trap t
urge u
vest v
whale w
plex x
yank y
zip z
a) I went to a Talon Voice cheat sheet and copied them out because I didn’t remember them. Is plex not right?
b) Talon Voice is a configurable voice engine, the commands are something you setup and people use common shared starter packs and then edit their own, so there isn’t a formal standard, plex might be different in some setups?
c) they just have to be sounds you can vocalise which are distinct from each other, and it helps if they are one syllable when using them often; there’s no reason they have to be dictionary words or mean anything.
There's presumably a lot of benefit to having stable and widespread standards in this area (so people can re-use their skills!). So hopefully this is now stable at least within this community.