The scope you guys are looking for does not exist. Tearing out the entire guts of a scope and replacing every functional part is WAY more involved than putting a different reticle in an existing scope, and apparently even that is a lift, as no company ever does this that I'm aware of (minus maybe the now-defunct leupy custom shop??). Living in the east away from any Ag I never have any use whatsoever for a scope that dials, so an exposed turret, ffp, etc is more of a liability than it is a value. This credo 3-9 is designed for me, not for you guys in MT. As Form said the turret under the cap spins with almost zero resistance after unlocking it, and it unlocks too easily, I would personally not want to rely on this for dialing because due to this it's a matter of when, not if, it accidentally spins in use. Its fine when capped, like its supposed to be.
Closest I just found filtering eurooptic's website is the new 2-10 leupold mk 4hd, which is 22oz...less than 2oz different than the trijicon 2-10 with mil and a turret, ffp, etc. I'd prefer the leupy reticle, but wont be buying that scope till at least several folks can demonstrate that it doesnt lose zero--my fingers are still blistered from the last leupy that burned me. SHV 3-10 is 22oz, and would be my choice if unscrewing the turret cap to dial is a legit need.
Otherwise, get a schmidt and bender 3-12 klassik at 20oz (which is probably the closest option to what you are asking for that actually exists), a SFP NXS 2.5-10 at 20oz, shoulder the weight of an additional couple ounces, or settle for a non-dialing scope. Frankly, I think the trijicon credo 3-9 with a mildot reticle for holdovers would make a fantastic 400-yard and in scope that never gets dialed. The S&B gets most cartridges out to 600 yards with the new turret. Everything else I know of is either suspect or is 22-25oz or more--a few oz isnt relevant to me as its still easy to get a standard off the shelf rifle under 8.5lb with a 25-27oz scope, but if you are looking for a crazy ultralight I think you are just SOL.