Trouble is these consonants like hard c and hard g are formed differently by different people so just writing out the syllable doesn't actually mean anything physical. It's like our word mkpumkpu. It's phonetically meaningless to you because European languages never use 'm' as a vowel and no language outside Africa has the consonant 'kp' (which is no more than a half-arsed european symbolic approximation). You wouldn't even get the 'u' right. Now a description of exactly how the tongue moves relative to the palate for your 'ku' - might be able to do something with that!