BP helped me to establish myself as an investor and I decided to go all in and got WA Real Estate license. 

You can arbitrage as long as you have your Vacation lodging services license, but finding an owner to let you Airbnb their property is very hard to come by.  

Now that my wife and I are looking to buy a primary home in a HCOL city, I am considering representing us as an agent since I hold a license here.

I am a licensed local property manager in the greater Asheville NC area and looking to  locate PM's in the area who may be looking to retire from the business and sell their book of business. 

That said, I would strongly advise that you get a lawyer involved, or at a minimum a licensed Realtor (you mention "brokering" the deal, and that you are a SWE for Google, but not that you are a licensed Realtor...if you are then disregard that last part).

A Business License is required to operate a short-term rental."

If this LLC was formed after January 1, 2021, it needs to be registered with FINCEN.Ongoing Compliance:Annual Reports: File annual reports with both Nevada and Michigan to keep your LLC in good standing.State Taxes: Check if you need to file state taxes or pay fees in both Nevada and Michigan.General Compliance Tips:Local Business Licenses: Depending on the city or county, you may need a local business license for operating your LLC.Registered Agent: Ensure you have a registered agent in each state where your LLC operates.

I know that if I had my real estate license it would be much easier to help him, which is a goal. 

You will need to get a STR license but they are not hard to get and over 800 are still available. 

Disclaimer first, I am not a licensed contractor.