what type of separate title can be done when council and WAPC refuse green title

I own a 3 acre block zoned Development in council TPS and Urban Deferred in the MRS in WA. It has one title and 2 existing houses but informal odour buffer restricting subdivision. No formal legal buffer has been gazetted but council and WAPC call it a buffer and write on maps there is a buffer and say no residential intensification in a buffer is allowed and they argued in SAT that creating 2 green titles is intensification of residential creating two lots where there was one. Divorced and exhusband forcing me to sell so he can get out of joint loan and outside this illegal buffer area council has approved on same size 3 acres between 44 and 72 lots. I want to sell each house on 600m2 of land leaving me with the remaining 2 1/2 acres and some money to fight for subdivision with money from the sale of both but how do I sell them? I thought tenbants in common but dont want new owners to be able to walk or use the whole of the land and worried how they would get finance and if they dont pay their mortgage for their portion could my land be sold to pay their debt? I read about strata or survey strata titles but can’t find out if council or WAPC have to approve survey strata or purple title also or can just Landgate approve it? The Water Corp have lobbied govt and Council to place a legal buffer but EPA refused in 2006 but all reports refer to a buffer and council drew a online constraints map with the wording of a buffer without any scientific buffer definition study or public submissions or recomendations to the Minister approval by Parliament nor published in the govt gazette. The Corp has for 20 yrs stopped residential subdivision or any development of 56 acres of prime urban land 5 mins from beach and restricted any uses. What type of title or how can I sell the two houses on land each buys without a formal green title subdivison or council and WAPC approval?