Chimney Base Support - Suspended Structural Supports??

[LOUIE24]

A pre-war building (steel construction) is looking to line their existing masonry chimney with stainless steel. Only problem is the existing masonry chimney use to have an underground shaft utilized for the flue gasses of an old coal fired boiler. They long since filled in the shaft just under the chimney with brick, rubble and I imagine concrete but it is truly unknown. Not to mention there is an issue with ground water underneath which I am sure is eating away at this fill. My thoughts are to support the metal liner with two suspended steel beams pitch pocketed in the walls of the masonry chimney then support it from there. My concerns are a few things: 1. The masonry wall to be able to be utilized as a fixed support on both ends and 2. The support of the masonry chimney from the foundation. A contractor brought up another alternative of imbedding rebar into the masonry chimney and pouring concrete to create a "suspended" concrete base on top of this fill.

Attached is a sketch. Any input would be appreciated. I will obviously be approaching a structural engineer with regards to this. Also trying to convince the building to just install an external stack on the concrete slab on grade but no one likes looking at a stainless steel structure outside their bedroom.[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1484940288/tips/nyea_optonline.net_20170120_141217_ywplpc.pdf[/url]