Reading your post I decided to have a quick look around myself
The front springs were lowered and I knew at the least the mechanic had to remove the tray to get at the strut bolts.
I wiggled the part of the tray mounting that goes up under the hinge and something popped off,so I had to remove the side black trim pieces to get at it.They would have to come out anyway.
I took off the other side too as it was no harm to clean under them,there was a lot of crud there.
In the pic you can see the 3 points of attachment of the trim pice the fourth ,in the middle is where the rear of the tray clips on to the hinge bolt.
Take off the bonnet sealing rubber and youll see the scuttle tray is in 2 pieces.
I cant swear to it but Im fairly sure the mechanic didnt have to take off the wipers to remove the lower part of the scuttle tray.
This is as far as I went as my drains arent blocked
and keen as I am to help out ,I didnt want to "scuttle" my own..groan .
btw took the mechanic like 10 mins to get the lower tray out and the same to put back..thats if he did take it out fully.I do know the side pieces came off cos I saw them left aside even tho vehicle was up on a hoist.
Maybe..worth investigating if just removing the bonnet rubber seal and side pieces will allow you to "lift " the top piece of the scuttle to gain access even without taking the wipers off.