I ordered from aliexpress remote 4 channel , it's arrived , I only tested it with buzzer ..
but it has 3 different setup via jumper ; 1 - on /off on every key press, 2 - on only if key is kept pressed and 3 - on one press is on off , cannot turn it on without reboot .
it said that range is 50-100 meters, hopefully with some more cable on both receiver and transmitter it could be true 100 m .
didn't test it on engine but I think should be fine .
there is video of test:
https://www.youtube.com/watch?v=UqnkWMbTbak
LINK on aliexpress
and few pictures :