I've written a storyline for a quest that I would like to DM in a campaign at some point. Early on in the quest the player(s) would get forcefully fitted with an item that they cannot take off until the end of the quest. It is a crucial key item for the story, one that the entire quest revolves around, which means not equipping it cannot be an option, else the quest would have no driving force. It'd be like Ben 10 choosing not to put on the Omnitrix, the story wouldn't even start. However, simultaneously I know that such 100% forced encounters should be avoided in campaigns, as it would make the campaign feel too railroaded.
Do you have any suggestions for what I could do here? How do you usually handle encounters or events that are 100% required for the story to work?