My understanding of sandsifter is that it works by executing an instruction next to a page boundary, which gives either a page fault error (the instruction executed correctly and then execution passed over to the next page which is presumably non-executable) or an error indicating the instruction was malformed. So, for it to work on RISC-V you need paging, and also interrupt vectors to work. The MMU was only recently standardized so I'm not sure if it's actually implemented in any hardware or software yet, but once you have those two things it should be fairly straightforward.
There's not really a whole lot to debate. You can bring up statistics and data, but the heart of the issue is not ignorance, but identity. People who are anti-illegal immigration generally only use it as a more polite and socially acceptable proxy for what they really want, which is to reduce or end immigration altogether (except perhaps from places that they share a common identity with). These people don't want immigration because they see this country as their home and feel it should belong to them and them alone. Immigration obviously gives people with whom they do not share an identity a stake in the present and future of this home. The people in favor of immigration typically either want more material wealth (the economic argument) or do not have an identity that differentiates between natives and immigrants, and so see refusal to allow them as oppression (the social justice argument).