Plenty of good food for thought here and I'm checking out all the leads. Thank you all.
I have found the integration to diminish both functions in my experience. I was at the Portmarnock Links a few weeks ago and could literally not find the golf clubhouse, until I just happened across it whilst exploring inside. The building offers no bespoke facade to the golf course, as the primary frontage, such as it is, is reserved for the hotel. The golf course seems to be very much 'back of house'. Compare that to the usual golf clubhouse which makes a virtue of the vista towards the golf.
A large part of the problem as I see it is how do you avoid the golfers experiencing the 'downstairs' functions of the hotel. The meat lorry and the bin wagons still have to service the building and if the golf section is kept away from the hotel it becomes really hard to avoid. At Old Thorns, you have to walk past the bin store to get from the pro shop to the 1st tee. I tried going the other way as I couldn't believe that was the primary route. I ended up in a corridor behind sports bar far away from where I intended, before finding a sliding door out through a function room. Not the designed path I am sure.
I'm glad to see there are some decent ones stateside, though they do tend to do these things better over there. I thought the main lodge at Bandon was pretty good, though that resort, more than any other, makes a virtue out of providing satellite clubhouses, each with a distinct character.