As far as refinancing, you can either do a conventional loan where they use your debt to income / DTI to qualify or you can use a DSCR loan which structures the loan off of the rent versus income ratio.More info on DSCR loans: DSCR loans won't use your income to underwrite the loan. 

To streamline the process, I want to ensure applicants qualify before scheduling a viewing.It would be beneficial to implement an AI-based system to consistently and efficiently ask prospective tenants the pre-screening questions I currently ask repeatedly.

serious buyers but also the property may not qualify for traditional financing.

- Do I qualify for for a section 121 exclusion sense I lived on the property for the first 2 years of ownership?

Here are the common exceptions:Relocation for Work: If your job requires you to move a significant distance from your current property (usually over 50 miles), you may qualify for a second FHA loan near your new workplace.Increase in Family Size: If your household has grown, and your current property no longer meets your family’s needs, you may qualify for a second FHA loan to purchase a larger home.Co-Borrower Separation: If you co-signed on an FHA loan and are no longer living in the property (e.g., after a divorce or separation), you may qualify for a second FHA loan for your primary residence.Non-Occupying Co-Borrower: If you were a co-signer but did not occupy the original property, you may qualify for another FHA loan as the primary borrower.Important Note: FHA guidelines typically require you to demonstrate that the current property will not meet your needs or is no longer feasible as your primary residence.2.

(Non QM means it is not qualified with Dodd Frank rules, but their own rules).

But, you need to understand the intensity, time commitment, capital needed, and skill set required.  

To restate, I wonder if it is feasible to pre-qualify prospects financially and criminally before touring.

@Shelley AustinWhile it sounds great - if they cannot qualify for conventional financing will they be successful and pay you?

If you intend to occupy this as a primary residence you could "assume" the loan meaning you would personally need to qualify with the existing lender to take on the loan in your own personal name. 3.