Pros / Cons of using a mudline suspension system when drilling from a Jack-up over a platform

Planning to drill a shallow (1,200m) well in 70m water depth, using Jack-up, over a small platform. Anyone looked at the pros / cons of using a mudline suspension system to support the casing loads at the seabed, rather than at the wellhead. Also, what are the thoughts on cementing all the annuli back to surface or leaving the annuli with mud - ie using the wash ports to clean out the annuli above the mudline.

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