These are at most trivial civil matters.

The net effect is your talking about putting non criminals in detention facilities rife with human rights violations.

As a hypothetical, if you can visit two countries and one offers the risk of indefinite detainment , which is roughly dependent on how behind the customs officials are on their quotas. Or another country that at most will just send you home, I think most will pick the country that just sends people home.

What process would you design for handling people who are denied entry at a land port of entry?