Here is the throttle lock I put on my Savage. It connects on the bar between the front master & the kill/start button & on the existing throttle grip.
Push lever down & it locks. It doesn't lock hard enough so you can't roll back the throttle while it's engaged.
Haven't used it much as I'm doing upgrades on the bike currently. I've used it some tho & it seems to work ok.
After the trip I'll know for sure.