Bed Wetting Alarm for a Four Year Old?

My four year old wets the bed, like every other night. I understand it’s totally normal and age appropriate, but I’m honestly getting tired of changing the bed so often, and I’m exploring ways I might be able to speed the process along. I’ve read that bed wetting alarms seem to be effective, but most of what I’ve read is for older kids. Would there be any risk in introducing something like that so early?

A bit more detail:

* obviously I do all the other usual stuff (no liquids before bedtime, etc) but nothing seems to work * He’s pretty resistant to overnight diapers, and I haven’t pressed it because I’d fear it would retard his learning to control his bladder overnight * I have him help me change the sheets in the hopes that it will help him connect the action with a (very mild) consequence