Removal of the alternator isn't that difficult as it's atop the AC compressor.
Better to remove it than fuss with jacking the engine a bit though I don't know the diesel layout.
You'll have a straighter shot at the hardware. At that mileage you might consider having the alternator rebuilt at a shop.
Starter & Alternator shops are around as they're small footprint business.
You'd get new bearings, a new freewheel (pulley) and a new regulator. 157K is about when my regulator went.
Get it all done once now and you can side-step a surprise (emergency) cheap replacement and the breakdown which often accompanies failure.
You'll get your Volvo one back.
If your battery is older, now is the time for that too.
Check your voltage in the morning (before use) and report back.
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