You already know what we like, bedbugs/dreamscapes and FF nights. I'd definitely use wool overnight on Nathan too rather than PUL as its more breathable and some of the moisture will evaporate from the nappy so it won't be as wet, you'll need to lanolise his woolies a few more times though before you use them overnight. If you'd prefer a fleece lined night nappy I'd try a Night Notions or an Upsy Daisy french soy night nappy. Some people also get on well with bumhuggers, Huggles and Baby Beehinds overnight.
ETA you could also try the Minki pocket you've got stuffed with lots of bamboo and hemp, will probably be easier for DH to use too.
Ryan wears large Minkis stuffed with either 2 bamboo terry squares and 2 EH hemp inserts or 2 PD bamboo inserts and 2 EP hemp inserts. Have got a couple of 50cm squares you can have if you want.