What alternatives to the Rwandan option does the UK have for handling requests for asylum and how do they compare?

Following on from this question, I am curious to know what sorts of options might exist for national policies on handling asylum claims, and what the pros and cons of each might be, in terms of:

• The overall degree of human suffering caused
• Cost-effectiveness
• Political expediency
• Compatibility with UK and international law

I can think of a few options myself but I lack the knowledge to evaluate them:

• The status quo - allow asylum seekers to remain in the UK while their application is processed, providing housing, education, healthcare and financial support, but not allowing them to work.
• The current UK proposals: deport the less vulnerable to Rwanda to claim asylum there instead
• The Australian option: hold asylum seekers in detention centres, sometimes offshore, while their claims are processed
• Open borders - encourage and support asylum seekers to find jobs to support themselves

How do all these stack up? What other options are there?