I know nothing of bermuda, but I can speak to cool season grasses. If you have a bent green or bent/poa green, or even a pure poa green that used to be bent, bluegrass fairways become a problem when you get to the transitions between fairway and green. Whether you want to call those approaches, collars, aprons, surrounds, etc, blue fairway to bent green never works that well. Bluegrass is a much stickier grass so playing bump and runs that land in the blue portion and release onto the bent green are inconsistent. Some places with bluegrass fairways solve this problem by making the approach all bent, then it changes to bluegrass a certain distance away from the start of the green. This is better, but then the problem then becomes that the bluegrass generally plays firmer under the same regime, as often times the bentgrass approach is laid over native soil, which plays softer than both the bluegrass fairway over native soil, and the green which is often laid over a foot of sand and drain tiles (USGA spec). So you get firm/soft/firm. Or you get firm/sticky/firm with blue laid up to the start of the green. In an ideal world you could do bluegrass fairways up to a bentgrass approach which is fully sand capped with drain tiles. This however would be quite pricey, especially if the short grass green surrounds are large. The wild card would be wall to wall fescue, which has succeeded at Bandon (although the greens have to be approaching 100% poa annua at this point), but failed at Ballyneal and Chambers due to greens performance.