Weird Witch Wonderings - Familiar folio rule interactions

[Oxybe]

So I'm playing in a Kingmaker game and we just finished the War of the River Kings module. We have some downtime and someone passes me Familiar Folio as their recent pickup.

I flip through and nothing immediately catches my eye until I reach the Synthetist Witch.

Currently, my Witch has been practicing a neat little "weird rules" trick, whereby she takes advantage of the share spell feature to cast Swarm Skin (advanced player's guide) on her centipede familiar, turning it into many swarms of insects for an indefinite amount of time. The GM did some houseruling where it takes a move action on my part to direct my familiar/swarms and I lose access to some abilities due to how the spell is worded.

Then I read the new archetype and my brain just kind of farted.

What would happen if I were to Merge with my Swarm Skin'd familiar that has turned into, say, two swarms of wasps and a swarm of spiders, or a swarm of wasps and a swarm of centipedes? Or a swarm of leeches and...

What traits, abilities and whatnot would I keep and gain? Does this even work?

Also: Duplicate familiar. If I duplicate my familiar that's under Swarm skin, do I get duplicates of every swarm or just one? Does it even work?

[Dave Justus]

From what I can tell, a familiar that had merged with you would not be a valid target for swarm skin and a familiar that was currently a pile of bones and a bunch of bugs would not be able to merge.

similarly, I don't think your swarming familiar would be a valid target for duplicate familiar. You could though duplicate your familiar and cast swarm skin on both, but that would of course take two castings.