
Jay he sounds a lot like my boy, just a little more manic haha. He is a slow to mature gundog breed too and I've totally changed tactics with him over the past few shows and he's been a different dog. Mine tends to act the fool when I try to stack him though, he thinks he's hilarious.

He is the ultimate exhibitionist in life in general. I stopped baiting him in the ring and started being a little more firm with him- I am a clicker trainer in everything I do so it was hard for me. I don't mean I've been nasty to him, but I have quietly but firmly told him to stop pratting around whilst I try to stack him. Not dissimilar to your idea of checking him, I guess. I know I've said this to you before as well but hanging around the ring before we go in has helped him as it takes the edge off the excitement of seeing everyone. It just depends on the dog as to what will work; if you try to quash him he might get more frustrated and play up more. It's getting the balance right. I wouldn't worry at all at his age.
My lad has confidence coming out the wazoo so it didn't upset him to be told to keep still/stay on 4 legs. But he is 3 years old

In a pup I would/did personally quite like it and would rather have that than making the ring a super serious place at that age.
I have a few critiques now saying things like 'super temperament' 'outgoing nature' 'delightful temperament' which mean a lot to me, so go with it and as he settles you will probably be all the better off for his happy, confident nature.

Practise and patience.