Basically telling them you'd like to quit, but want them to pay you money/benefits to do so? But if not, you'll keep working and let's just forget you brought up the idea of you wanting to leave? Yeah, that won't go over at all.
They may take your offer as an ultimatum and let you go without a package or anything. Rather, it sounds like they'd consider you disloyal or start looking at whether they can replace you easily since you've indicated that you want to leave, and might do so at a time inconvenient to them, and will therefore be better served to find your replacement and kick you out then. No matter how much you think you are a valued employee, they will drop you like a rock the instant they feel it is better for them to replace you or get rid of you completely.
So you mostly may be shooting yourself in the foot doing this.
Honestly, it sounds pretty presumptuous and there is absolutely no reason they'd give you a package at all unless they are actively laying people off and you volunteer to take their place, and even then there's no guarantees that they'd offer you anything other than the door.
Wait to make this offer until you really are ready to leave. Then you get a package, or not, but in any case you can take your leave without worries.