I'm also looking for someone (attorney) who understands how to setup structures (LLCs, Land Trusts, etc) to better formalize and achieve anonymity as much as possible.

You might be able to get them out quicker via any squatting/trespassing laws since there is no agreement in place, but likely formal eviction is needed.As for trying to keep them, I would general recommend you don't. 

I've been buying at Foreclosure auction  in Indiana (judicial state) with about 8 properties under my belt over the last couple years.  

Since the foreclosure crisis mortgage lenders have added a ton of security for themselves in the docs to hedge against future legal challenges and losses.You need to know if you are in a non-judicial or judicial state and based on age of the mortgage doc even if non-judicial if a "power of sale" clause exist in the mortgage docs.

So you might try asking your inspectors if either of those are options because it will save you the time/hassle of having to schedule a formal re-inspection.For things like "needs to paint exterior door two different shades", which isn't even an actual Section 8 requirement, I would just politely say to the inspector something like "Oh, I didn't even realize that was a requirement.

In judicial states all the parties would have to be served, which would be impossible with 50 1% interests to supposed foreign nationals.  

This letter again would state their balance but also that they have 3 days to pay before formal proceedings are started.This process shows the judge that you have made multiple attempts to collect payment and aren't being unreasonable. 

Are there any formal or informal meetups happening?

The terms are not comprehensive and we expect that additional terms [including reasonable warranties and representation,] will be incorporated into a formal agreement (the “Agreement”) to be negotiated.

I think the difference is judicial vs. non-judicial foreclosure proceedings respectively.