Unfortunately, without first year marks, that’s pretty difficult. I’ve got some information, but it’s a bit too specific to share here.
Your personal statement is going to be vital for those programs, as there will be plenty of questions about your desire to study law after performing decently well (ok, quite well actually, but I get what you’re saying about your concerns re LSAT) on a US university course.
Speaking of the LSAT, have you begun researching the LNAT? It’s not a universal requirement, but will be something you want to do.
As for the PGDL/Senior LLB, both of those would require you to graduate first. At that point, I’m not sure why you don’t just go on to a US law school that has a good rate of putting people into Big Law, even if they aren’t a T14 (e.g. Fordham, Wisconsin, Georgetown [a cheap shot, I know]). Also, state bar associations don’t have as much respect for the Senior Status LLB; many mention explicitly that they want someone with three years of common law experience.