Good there are many points of agreement, but also a bone of contention.
Leo wrote:there can be no question that Buddhism is teleological, and therefore reductionist by definition. Life can have no purpose any more than the universe can have a purpose. Purpose is a construction of the human mind and thus only minds can have purpose
We really need to get straight what the meaning of 'reductionism' is. Basically it is explaining something complex in terms of its simpler components. In the case of biology, biological reductionism nearly always appeals to genes, evolutionary theory, and lately neurological sciences to argue that even though humans appear to be willing, intelligent subjects, what they
really are is 'nothing but' {a species of hominid/expression of the selfish gene/a 'moist robot'} - in short, something other than, and simpler than, an intelligent human subject (or, God forbid, a soul.) Something that basically those in lab coats can, in principle, understand and explain.
So reductionism really is 'nothing but'- ism. It is saying that we're really 'nothing but' one of the above types of things. That is the argument in many of Dawkins' books (before he became an anti-religious pamphleteer) like Unweaving the Rainbow, the Selfish Gene, the Blind Watchmaker, etc. A near-perfect statement of biological reductionism is Francis Crick's 'The Astonishing Hypothesis'.
(Buddhism is certainly not reductionist in that sense, although arguably the abhidhamma can be reductionist, but that is tangential here.)
Now as regard 'purpose'. I don't accept the the Universe is actually purposeless at all. (I suppose I would have to admit that in the context of Western philosophy, I am generally in agreement with intelligent, non-fundamentalist theistic philosophers, such as Keith Ward and Alistair McGrath.) In any case, I think the argument that purposes rely solely on
human minds, is very much a statement of the type of secular materialist view which, on the one hand, you criticise, but on the other, you often seem to advocate. So I think your understanding of what does and doesn't constitute 'reductionism' needs a bit of work.
Biologists, having discarded 'teleology', have had to re-invent it under the term 'teleonomy', because biological forms are everywhere and always animated by purpose. Only 20th Century humans seem to think that they alone are capable of forming a conscious intention or discerning purpose. (On that note, have to go and keep painting the pool. Back much later.)