Quote from @Samuel Kim: Hello i am a doctor who wants to use cost segregation/bonus depreciation on my 9 rental houses, my home maker wife wants to meet the 750hr test to obtain real estate professional status and material participation.

Generally there are multiple units for each "zone" if you will when I've seen them installed.Regarding your problem at hand, I personally would simply adjust your plan to move and make your initial plan to get the current issues resolved, while costly now, in the long run holding onto the unit will likely pay off. 

Your cost basis would be ALMOST zero if you ever sold.

Are there other, more cost-effective alternatives to gain similar support and knowledge?

I've seen estimates that are off by 300% when all said and done (e.g. the original bid was $10k but the final cost was closer to $30k).

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Issues 1) even garage conversion ADUs in single family zoned areas typically cost more to build than the value that they add.  

Determine the most likely sales price of the build (factor in the cost of the land also) and include all selling costs to arrive at your net profit and ROI. 

These costs would eat into your profits.The case for sellingEven at $125/month, your cash flow is slim, and any unexpected expenses could turn this property into a liability rather than an asset.

For me, I could handle the increase in cost and still pay much less than If I got a 4/2 SF.