Eleven Hawaii State Senators have introduced SB 119, which says that a presidential elector who votes for someone in the electoral college who did not get the most popular votes in Hawaii would be deemed to have resigned. The remaining electors would choose a replacement.
The Hawaii Senate only has 25 members, so this bill seems somewhat likely to pass the Senate, if it has eleven sponsors.
In December 2016, a Hawaii Democratic presidential elector voted in the electoral college for Bernie Sanders instead of Hillary Clinton.
The bill says if the presidential candidate who carried Hawaii has died or become “mentally disabled”, then electors are free to vote for someone else. The bill does not explain who would decide if the presidential or vice-presidential candidate is now mentally disabled.