Marlene, i would just put a new "boosted day nappy" on him, before or after, each night feed. (until you get night nappies).

peapods bamboo inserts are good value, glad you have them.

you're not a dill hon, you're prolly doing 20 things at once, plus keeping hold of your little Houdini. (i am still having trouble visualising, how the heck you could FIT a GK insert PLUS a folded flat in that pocket cavity - you deserve chocolate for that feat, woman!!!

at 8.5kgs, that's a good weight, for either getting Size 2 nappies, or larges (dependent on brand of course). The OSFA nappies usually go until 15 - 16kg. so that's another option too. except for the Mandy Mac Purple Nights, which goes until 25kg. but with such a houdini, maybe a ai2 or pocket style night nappy, would suit your lad better? (only one thing to put on then).

with the two lines of defense style (fitted and woollie etc), you lie them down to put on the fitted, but you can put on the longie or flongie easily, when child is standing up. but it is one extra thing to put on.

but yes, i would be ditching the bonds wondersuit quickish - anything firm fitting - compression leaks? wicking? hmmm. Have you got anything else to put on him that is LOOSE around the crotch area? a size too big wondersuit?
a top and a pair of too loose leggings?
a sleeping bag?
just think VENTILATION.

i think if you change him at each feed, you'll get away with this.