I looked up the Astute dimensions, according to the wiki it would come out at about 78.5mm beam at 1/144.
So unless the hull is extremely thick or the dimensions are out I would expect Ron's 70mm module to fit, although it will be a snug fit, easy to check if you already have the kit. Some of the module is likely top sit above the surfaced waterline if going for a scale effect.
I do recall Ron mentioning the kit had some internal protrusions which made the conversion trickier than the Seawolf, not sure if he was referring to the pegs I've highlighted in the pic, but if so, they would be soon be history with a Dremel and a sanding drum.