If you're flying in and going directly to your chosen club/course/town which first (and only?) airport you're planning to land at and how far and how long will it take you to get from there to your chosen club/course/town is key. (Also, are we looking at a one year only visit or recurring trips?)
If this isn't a concern Aberdovey would be a good choice in Wales. A Dunfanaghy base for the NW Donegal area would be one from Ireland (Dooks too?) and for Scotland, pretty much anywhere along the Moray Firth coast apart from the usually named biggy courses/clubs.
As a slightly different take, look out for 'Golf Weeks', where a club/course, and many of the sort of clubs mentioned herein will have them, hold a competition each day and all the entry fees will probably cost less than an overseas membership, examples would be Pennard, Tenby, RSD/Harlech, Brora, Golspie, Tain etc although even with practice rounds you might not get 15 rounds in this way but with mid-summer mornings/evenings..........
atb