Get something that when you move out will be desirable and something someone else will want to buy or rent.  

A Partial pays you principal and interest back at that desired rate.

But if you can save a lot of cash, paying cash for the rehab might be more desirable.

Also, if I end up switching jobs (for a much higher salary, but obviously it will be a brand new job) will that make me much less desirable to lend to? 

You just need to be able to ask or, like in your example, TELL what you want (and be ready to walk away if it doesn't go as desired). 

Guarantees they're out or they pay you, either is desirable.

We discussed seller’s desire for at least ~$7K - $8K cash walkaway money plus buyer pays reinstatement amount ($5400).

No HOA's to be found in less desirable areas.  

The property is in great condition in a desirable area.

The house is in good repair but a basic small 2br in a desirable neighborhood, valued at $420,000I’ll just get to the point-is there any way can I make money on this and help them out at the same time?