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Millburn is on current OS Map https://osmaps.ordnancesurvey.co.uk/57.28151,-3.45238,17 and I'm pretty sure that the remains of the wheel were still there when I visited Glenlochy a couple of decades ago.

Indiana, Mum said the original Delachule burnt down sometime in the late 50s or 60s but was already abandoned and quite dilapidated. 
When I get round to investigating the Camerons I may well be looking at your entry here again. 

By the by, when my 2xg grandfather was baptised by Donald Carmichael at  ceremony in 1826 (his parents are (Prots) in a Roman Catholic ceremony at the Cults, one of the sponsors was Alexr McKenzie of Dalchule which I think must be the Dalchoille I referred to earlier on in this thread as that is on the Avon.   There is a baptism further down the page of Donald, son of William Shaw Milton of Inverourie, sponsors Alexr and Jane Shaw of Delichule, which must surely be the Delachule you are referring to on the Conglass so these must be your Shaws!  On the parish register of the birth there is a Mary Shaw, wife of Archibald Stuart of Balchruicht, who had a son John.  Also a Euphemia Shaw to Wm Shaw and his spouse Grace Stuart in Milltown of Inverourie.  If these are also your Shaws and you don't have the image I can send to you.

Is it possible that the Duke of Gordon was at your Shaw's wedding because it was a good opportunity to meet many of his tenants?  Tenants whom, incidentally, he was determined not to enfranchise - he bitterly opposed the Great  Reform Bill and only weeks later was one of only 22 peers who opposed it in the House of Lords.  It was passed and the resulting Reform Act gave the vote to any tenant paying at least £10 per annum rent.  Certainly my 3xg grandfather would have qualified as he was paying £14 in 1809.

Which reminds me that there was a similar-sounding small farm in Strathavon, Dailchaoil.  It's one of the furthest farms up the glen, Dalestie is the only one I can think of which is higher other than Inchrory, which has always been a shooting lodge.
There was still a McHardy in Auchriachan until the mid 1980s! 

I think that the farm of the McIntoshes is most likely Auchriachan and the witness was Alexr. McHardy of Lagganvoulin.

Sorry for the delayed reply.  Although Francis Smith is named as the reputed father of my ancestor there is enough conflict in the official documents which leads me to doubt the truth of this.