Are there any  other effective  platform to list  the house for that purpose ? 

We have listed them with real estate agents we like and have used other transactions.

The ways involve a combination of undefined tech innovation and customer willingness to engage in unconventional transaction methods.There is options now, today, for buyers/sellers to transact real estate for 1% and less of the total transaction $. 

Since Zillow doesn’t allow live links in messages (even links to articles on their own site), it’s also challenging to direct people to my own website, where integrating a chatbot would be much simpler and more effective.

Now, you are asking can you use a Gap/Transactional funder for the downpayment and closing costs? 

If you're licensed (or unlicensed) and are a principal in the transaction, you can use any form you wish but it is foolish to use a form that does not have the required notices included it. 3. 

I've seen a lot of this lately where GPs are offering outside investors pref equity to effectively "save" the project from foreclosure.

I also could take 2.5% from the transaction. 

Not everyone has the same priorities - some care about interest rates the most, other care about the points the most, getting the most leverage, closing timeline, reputation, smoothness of the transaction, etc. 

I am an investor, agent, and mortgage lender here in AZ who primarily does investment transactions.