Conventional non-owner occupied loan. 20% down.What was the outcome?

It took 6 months of market research (you won't reinvent the wheel), 2 months to build spreadsheets (analysis paralyze), 6-7 house tours (leverage a local RE agent), and 30 days to close with a conventional loan. 

I talk to many of my lenders who are sitting on tons of garbage inventory they had to take back.

Perhaps take a look at:  https://www.loopnet.com/ and see which types of commercial lease listings interest you and from there take inventory of which brokerage and listing agents are prominently features in the space that interests you.

Typically you aren't buying a fixer upper with a conventional loan.

I recently bought my first investment property with a conventional loan, but the lack of W2s and living overseas made it a bigger hassle.

Also there is no restriction on acquiring conventional loan on primary residence even if you have maxed out on conventional loan for rentals.

Sounds like if I stay conventional then my best rates will no doubt be the 25% down options. 

Should we do a conventional loan?

If that country is part of the Hague Convention, a local official can handle the signing and attach an Apostille authenticating the document(s).