I have a lot of other investing ideas as well that I hope to be able to use in the near future as well. 

Separate the work into 3 separate categories: 1) Those that are specifically related to the future STR usage, 2) Those that benefit you while living in the house and have zero bearing on the future STR, 3) those that benefit both you and the future STR....assign a percentage to the usage.Be specific and complete.

[Because after all that - you haven't paid off your primary anyway, and won't in the near future!]

Getting a FincenID makes it easy if you have more than one or expect future updates. 

I am looking to buy into one of their offerings in the near future using a SDIRA.

Avoid future trouble.

Huge cash out in the future from appreciation or active income from rentals now? 

It sounds like you know how to avoid this in the future, so what to do with the situation at hand?

And @Kory Reynolds brought up a good point about recapture of the section 179 deduction if your business use drops under 50% in a future year. 

It’s best to channel energy towards the future and not dwell on negative things.