I have owned my 99 V70-T5M from new. It now has 156,000 miles. At around 50,000 miles, I replaced the A/C compressor clutch because of excessive gap, and in those days, we didn't know about removing shims. At about 95,000 miles, I removed a shim to close up the gap. At 135,000, the gap was once again too wide, but now the brickboard talked of the breadclip fix.

I cleaned the outside surface of the A/C clutch plate and, using 3M Super 77 multipurpose adhesive, installed the breadclips. Immediately after, I drove the car on an 8,000 mile trip from California to New York & back, with no A/C problems. Fast forward to July 2106, returning from a California - Indiana round trip, I was almost home when the A/C cut out in 108 degree weather and came back on at 105. Examination showed that 2 of the bread clips were gone. It had lasted over 20,000 miles, but not the 45,000 that comes with a properly shimmed clutch.

At this point, I removed the clutch plate, which was at .040" gap, and found that the only remaining shim was only .012", so there was no point in reassembling it. Fortunately, I had saved the original clutch, so I shimmed and installed the outer plate from that one, and it's back to .014", so it should be good to the 200,000 mile mark.

Conclusions:
1. It looks like you can only readjust the gap by removing shims once, although it may work to grind down the surface where the clutch plate sits against the shims.
2. If there is a tie-wrap fix that works as well as bread clips, the tie wraps are probably less likely to come off than the bread clips.
3. I have not seen any information on whether the bread clips can be layered when later adjustment is needed.