Stop trying to reinvent this job.
sealing around the service pipes is easy.
you do not try and cut a hole in the membrane and seal that to the pipe.
cut a 300mm hole in the membrane, poke it over the pipe, then cut a 600 mm square of extra membrane, cut a 120 mm hole in the centre, poke it over the pipe and tape it up, then tape your patch down to the main sheet.
easy, each pipe penetration will take 15 mins max.
why buy two membranes to do one job.
if your finish concrete is rough the pir insulation won’t give a monkeys it will just deform to the shape of the slab when it has 15 tonne of screed on top of it.