Also, what are some other low cost amenities that I can add to my STR that will yield a higher ROI?

In my experience that makes this a low risk deal as there are very few ways to lose money on it.

@William J Anderson you want assistance in analyzing T-12s for the purpose of purchasing a property?

Quote from @Carlyn Chism:I agree with Chris on a lender that might be a scam or make you may so much money interest because of the low credit score that you make $1.00 on the flip or no money.  

Several years ago when the low flow toilets came out, some just didn't work well at all.

Does Hard Money typically cost 30-40% of the purchase price?? 

A a low-temp sensor be added for you to be called if the temp falls below 55º ?

Long term I think you end up losing your shirt here, so if you can get out without too much damage I'd take my lumps and move on.

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

Most cost segregation firms will provide a free cost/benefit analysis quote to help you determine if the tax benefits from the study will outweigh the costs.