Hello.
I had an idea to make English, but each phoneme is swapped for an opposite. This is easy to do for vowels - for example, /i/ and /u/ are opposites, because one is front and the other is back. I tried to figure out a similar system for consonants and have been stuck ever since. So, how would you calculate an opposite for /m/, or /h/, or /r/? I’m sure there must be a way to do it, but for the life of me I can’t figure it out.
For m i’d say the opposite is k. M is a labial consonant and k is a glottal consonant.
For h i’d say f or v.
For r i’d say there really isn’t an opposite since it’s made in the middle of the mouth.
I used to ipa table to choose the sounds.
https://en.wikipedia.org/wiki/IPA_consonant_chart_with_audio