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Shatabdi Express is having 18 coaches.

So if they want then they can run Kalka Mail with 18 LHB coaches then Pantry Car , 3 Sleeper, 1 3rd AC and 1 Second AC coach has to be removed.

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option is running train with 22 LHB coaches but last 6 coaches can be locked after Chandigarh.

EOG, PC and 4 AC coaches can be included in those.

How about reduce 12311/12 to 16 coaches Fully AC rake (with combination of 1AC, 2AC, 3AC, 3AC Economy), and run 12329/30 WB SK Exp upto CDG for 4-5 days a week - to make up with good combination of Sleepers and Unreserved coaches?

I see noone ever raising the point about WB being the only state in India with just a weekly Sampark Kranti train! (Why 4/5 days is so that North Bengal / NJP also can have parallel run for remaining 2/3 days of North Bengal Sampark Kranti).
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I'm sure alternate RSA can be made for 12379/80 Jallianwala Bagh Exp. But this is a critical need of the hour, to maintain connectivity between Chandigarh/Kalka/HP and Eastern India. If ER cannot take care of it, then better to hand over to NR!

In that case, if at all this train were to become a 16 coacher, even then it would be reduced to just 2-3 Sleepers (from currently 10)... much like Upasana/Kumbh, would it be of much help - given the quantum of rush on this train?

Because given the current infrastructure around Kalka railway station, it's frankly quite herculean to construct platforms there now for 22 coach trains. For standard 22 coach LHB rake, it'll have to be short terminated at CDG, which again some of our forum members were saying wouldn't be...
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viable, not to forget Shimla/Kalka's sole connection to UP and East India to be lost forever.

Any which ways, increasing frequency of WB SK with extension upto CDG for now seems like a pretty feasible option (I wonder why Railways has not built second alternative terminal for such an important city like Chandigarh already, at SAS Nagar Mohali for example).