Execute and bury with a pig. Worked in the past.
Muslims are a tribal culture. Any measures, to be effective, must impose consequences on the bad guy's family, tribe, and nation, sufficient to have the family, tribe, and nation want to discourage any repetition.
My guess is that suicide fighters are depressed individuals who want to die. In Islam, the ONLY guaranteed way into Paradise is to die fighting for Islam. Therefore, the ONLY acceptable way to commit suicide, is as a suicide fighter.
The "burying with pigs" gambit won't work if their clerics assure them in advance that such will not interfere with their going to Paradise.