Looking at the location, I would say its probably better dived from the Belgium side. It is also looks like an inshore wreck, which again makes diving it from the Belgium side probably better.
There are charter boats at Dover, but it looks like it would be outside of their normal range.
To be honest, a dive that shallow, that far away, I wouldn't sign up for unless I had very good reports.
Its shallow enough to be badly smashed up unless it's well sheltered.
You are probably better with some advice from Belgium members on this forum.
Addendum
The Belgium note on the Wrecksite, does say the wreckage is spread over a large area, that was in 2007.
So as I suspect, probably very flat, very broken, and difficult to identify specifics.