You say it's not hard, but one of those threads you linked is from someone who, I happen to know, has yet to make it work. (It's some guy with funny looking, retro style facial hair. You can't trust people like that.)Gap staging a two stage of this type is problematic because the booster needs a recovery system. This might be of interest
(12) Semroc Nike Tomahawk | The Rocketry Forum
or this
(12) Terrier-Orion Two Stage Conversion | The Rocketry Forum
-Bob
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