It is normal for your cells to manufacture bits of RNA into proteins. It's what they do all day. There is no hijacking. Cells do this constantly. And massively parallel. If each cell could only translate one rna sequence at a time you wouldn't have made it past zygote.

It's normal for Antigen Presenting Cells to present antigens on the surface of their cell membrane. It's what they do all day.

So, yes. Every bit of the process is completely natural and normal.