Adding 1/4tsp KMETA every three months is recommended and racking at the same time is easy enough. You can splash rack a couple times to help with any degassing and then seal under vacuum for the next three months. I check and top up the vacuum regularly just to keep it tight. I think 12 months, 18 months, 24 months are sorta the regular bulk aging timeframes. When you bulk age across two to three seasons you also have the ability to choose your blenders a little better. ie; to balance alcohol, tannin, acidity, fruit, etc into a single bottling...
Cheers,
j