Magician wrote:
If I use enough suitable sealant in/around the hole will this be OK?

I saw this on one of those Tommy Walsh DIY programs once.
He put up a stud wall on a screed above a DPM and did exactly what you
suggest. The sealant went into hole before any rawlplugs. I was a
little surprised at the time but on reflection it did seem sensible.

I'm guessing someone is going to disagree with me but fair enough.

Charlie