Some notes on return migration

I am writing about foreign workers. In host countries that is what one calls them, these newcomers/ temporary workers/ immigrants who take in these jobs a local will not want doing, daresay last in doing. These foreign workers, from my side of the conversation are some home countries' exported labour force-- usually driven by economic needs, to feed their family-- and in many ways a sending country's saving grace. Remittances are inflation free, and sending them away makes less people to sustain. This is in many ways an exploitative relationship, but for the very sake of agency let's try to believe that this is a give and take relationship, an agreement among equals. 

So when issues regarding the management of 'return' (and by return I mean not just physically coming back, but the whole process involved-- of remittances, of investments, of guarantees, of homecomings) comes up I think there's only one interest that need to be highlighted here, and that is of these overseas workers. One should be asking more, and paying more attention in terms of managing return. Mainly because it involves a great deal of hindsight. IMHO it is all about investment, that idea of return revolves around the idea of this fair exchange of goods and services. A transaction. Ex: I give you money for managing my health equals you manage it. I send you money to go to school, you go to school and finish it. Whether or not there is an emotional (and I like saying this-- 'affective') tie and untying involved in these transactions is one thing. But to remit money to contribute to Universal Health, or pension, no doubt about it, it has to be a concrete transaction. There are clear expectations involved. 

So imagine hearing about non-remittance of agencies, or any mismanagement issues that come up every now and then, slaking in the middle of the night, feverishly wishing they don't get noticed.

I can imagine a lot of money involved here. How much? To what extent are these deliverables possible, does this guarantee everyone a payback. A 'return'?

Now this brings me to this question: if say, all these foreign workers sent out, contributing to more than 15% of the economy--they get sent back, right away. Is their sending country ready to reintegrate them, to give attend to their medical needs (because these workers contributed to everything the state asked them to), or pay for pension? 

What are needed anyway, and can these be addressed through policy? If there are existing policies, what are they and how in tune are they?