As a simple problem solving thought experiment, I’ve been saying the same thing (purposeful infection with a cold virus). It’s not likely to be an outcome that we would want to use, but from my laymen perspective it sounds much easier than creating a vaccine (the cold virus already exists). But of course testing would have to take place and it could actually make things worse.

While the solution has not yet been identified 100%, we should be looking at everything. That is just good problem solving.