I'm going for an Open, trying to build up NC subjects, focusing on English and Science with French as my MFL so I'm considering:
Level 1 Bon départ: beginners' French (L192) Molecules, medicines and drugs: a chemical story (SK185) Ouverture: intermediate French (L120) Start writing fiction (A174) Starting with maths (Y182) Understanding the autism spectrum (SK124) Understanding the weather (S189) Volcanoes, earthquakes and tsunamis (S186)
Level 2 Perspectives on complementary and alternative medicine (K221) Worlds of English (U214)
I've done Start Writing Fiction (A174) which I absolutely loved, my tutor was really encouraging and I think my writing got better very quickly. I haven't done any of the short science courses you've listed but I have done Elements of forensic science (S187) which was really interesting but had a slightly frustrating skills based assignment at the end. I presume that it typical for the short science courses but I felt it didn't really test what I'd learnt. I am an expert on blood spatters and fingerprinting now though so if I ever want to write a crime novel I'm all set!
I've done starting with maths but it was y162. Got my results yesterday actually! Very easy, material is GCSE level. Was a good intro for me, but sort of led me to a false sense of security- the tutor was very involved, and obviously writing on a maths course is very different to writing any other essays! I would suggest the next level up on the maths courses, think there are links online to check your knowledge, see how suitable they would be?