For the concerns with foreign filings you can place your property into a land trust, and in doing so you remove the requirement to complete the foreign filing for the LLC if it is in another state.

In God we Trust ......................all others pay Cash 

The agent-client relationship needs to have trust and it is difficult to build this online without social proof. 

So would it be right to say to an heir, "I understand that the house has a reverse mortgage on it, however I'd still like to make an offer on the property if you're interested", and go from there, OR, would you try to see their education level on how reverse mortgages work when trying to get the house under contract?

You have to trust the contractor will have your best interests in mind and not gouge you on the pricing  or respond to tenant related or nonsensical issues (ie, I have a broken slat on my miniblind and need it to be replaced). 

Houston Real Estate Highlights in August(* asterisk denotes that the “Harvey effect” has been removed): Single-family home sales rose 7.6 percent year-over-year, with 5,844 units sold*;Days on Market (DOM) for single-family homes declined slightly to 49 days;Total property sales jumped 36.8 percent, with 9,978 units sold;Total dollar volume increased 40.1 percent to $2.86 billion;The single-family home median price rose 3.0 percent to $236,870, reaching an August high;The single-family home average price also achieved an August record, rising 1.9 percent to $300,670;Single-family homes months of inventory was at a 4.1-months supply, down from 4.3 months last August and equal to the national level;Townhome/condominium sales rose 12.3 percent year-over-year, with 457 units sold in 2018 compared to 407 one year earlier*;Leases of single-family homes rose 7.6 percent with the average rent up 3.4 percent to $1,926*;Volume of townhome/condominium leases fell 8.6 percent with the average rent up 5.5 percent to $1,639*HAR https://www.har.com/content/newsroom?

Here are the high-level steps: 1) You LLC is a multimember LLC. 

Look at partnerships / see if you have a good buddy or two who you can trust at who are into the real estate.

So depending on your experience level may just be better to hire someone for plans!

If you have taken those plan documents to Solera and opened a trust account for your Solo 401(k), then you have a functional plan.Of course, the key to operation and usage of a Solo 401(k) is having access to appropriate guidance, so that you understand what you have, how to administer the plan, and what you can and cannot do as far as executing plan investments so as to remain within the IRS rules.