you hate digraphs with fiery passion, and yet you must have only symbols that may be easily typed w/ vanilla xcompose
you are a picky mistress
/p t d ʈ ɖ k ɡ q ʔ/ <p t d ṭ ḍ k g q ʾ>
/ʈʷ kʷ qʷ/ <tw kw qw>
/s z ʃ ʂ x χ ħ ʕ h/ <s z š ṣ x ḫ ḥ ʿ h>
/ʂʷ xʷ χʷ/ <sw xw hw>
/m n ɳ ŋ/ <m n ṇ ŋ>
/ɳʷ ŋʷ/ <nw ŋw>
/l t͡ɬ d͡ɮʴ/ <l ł ḷ>
/r w j/ <r w y>
/a i u aː iː uː e o/ <a i u aa ii uu ai au>
Alternatively if you hate double vowels do <a i u á í ú e o> and replace š by ś, which crowds the top line less and also only one diacritic is harmonious.