Have 3 Chest at the end of the boss fight. Add 1 key drop each successful encounter you run through (getting max score)
To make it fair so people don't botch other peoples runs, have the keys only usable for that run. Please upvote so mods can see this. 1 chest after one completion is too little for the effort especially for heroic. This is the reason the reckoning sucks (granted you can get the exact weapon and masterwork you want from menagerie) I hate doing more than 3 runs of the reckoning just for a chance to get a weapon and even then it won't happen. No one is going to want to run menagerie over and over for 1+ gear
Edit: Make one of those chest or the first chest a powerful drop while you're next trip gives you the second powerful drop
Please UPVOTE so mods can see.
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To be fair, getting 100% completion on an encounter in order to get keys will just make matchmaking irrelevant. Most of the time in matchmaking I can usually count on 1-2 encounters being fully completed. Even with the gauntlet cheese. I’d rather they don’t even touch it. Mainly because in year 3 we know that all our current armor will be useless. Weapons may or may not be still be useful. It will probably take three months for most everyone to get the perfect rolls on everything. After that who cares because hardly anyone will be playing Menagerie after Shadowkeep drops.