I take on board what you say but I can think of no other word to go with suicide, other than commit. 'Take one's own life' or 'kill oneself' are equally harsh. Of course 'commit' doesn't only apply to crime but that is probably its origin in this case.
I hear them say on Raidio na Gaeltachta 'chug sé lámh in a bháis féin' - he took a hand in his own death.
I've been wrecking my head trying to recall the terms suggested as an alternative. Looking online, I can see that as a consciousness raising exercise, it's clearly in its infancy. Most references to suicide use the term "commit".
I did find this though, which explains it better than I can...http://www.spanidaho.org/stigma.shtml
They suggest terms like "completed suicide" or "died by suicide".
Language Considerations Related to Suicide
“The difference between the almost right word and the right word is really a large matter – it’s the difference between the lightening bug and the lightening.” - Mark Twain
The language we use can make a significant difference in reducing stigma. It is vital that we begin to use, and educate others to use, terms other than “commit suicide.” “Commit suicide” connotes criminal or sinful behavior which reinforces stigma. There are better alternatives.
Use this language:
"Died by suicide"
Avoid this language: