Perhaps the "honoring" of Elser is not a known tribute because he failed anyway. One can perceive that he was rebellious with his supervisors, a clue that identifies him as a nobody's land person.
Checking at his personality, one can guess that having him successful with the bombing and killing Hitler, Elser should have found another excuse to complaint against the Swiss government and plant another bomb to kill another leader.
Germany was passing terrible moments due to the economic humiliation imposed by the other countries of Europe (with England as the leader), and for this reason the German populations agreed with the Nazis, who promised "liberation" from that "slavery".
Elser saw his own and personal "world" affected by the measures of the Nazis, but Elser apparently ignored in purpose that the critical and low situation of Germany in those years was caused by foreign intervention instead of the tyrant government.
He might wanted to stop a coming war, but he himself started "a personal war" when he used a bomb.
He lost in both ways, because Germany went to war anyway, and he was killed by his enemy at last.
What he has reached is a recognition for his attempt to kill Hitler before WW2, he almost did it, but apparently his "god" didn't help him to be successful.