Peter,
I'm not familiar enough with your actual parts so can't look it up for you - but think there should be enough information on the Devon website (and Central wheels too) to work it out. Both are quite good resources for identification of the correct parts.
If you clearly identify what parts you are in possession of and look them up - you'll soon be able to check if you have a set - or at least what you still need to complete the set.
On my A10 I have a WM2 rim front and back, one is 1X1 dimple (spoke pattern) and the other is 3x1 I think. Spokes for each are not interchangeable as you've already said - the angles are different. There are only the 3 or 4 variables - first one is easy and that's the number of spokes. If you work out the rest from the listings on these websites (either which wheel fits your hub or which hub fits your wheel (Think you said you has a selection of hubs)) - then make sure you know which spoke set fits your chosen combination.
After my wheel building exercise I learned a little bit about the combinations - so if I can work it out - anybody can :-) That said, I kind of wish I'd had the original dunlop rims re-chromed - however I have to say my Devon Rims look so nice, it'd be a shame to toss them now.
Good luck with the checking.
Raymond.