Sub base question

[chequers]

Hi recently posted the panache question below but prob would have been better highlighting the real issue i have now in that i have 6mm down blockpaving dust spread over 80sqm to a depth of 100mm over solid ground
Having now changed my mind from block paving to 450 slabs is there anything i can add to this sub base to strengthen it ie add stone and then wacker it in etc or mix dry cement
Its been down two years and is solid to walk on
I cant face taking it all up and disposing of it
I would add a.pic but not sure how to add it on to this link
Most importantly i appreciate that this is all at my own risk and is not advisable but it is for light use and i am willing to take that chance so ideas please
Thanks for previous postings too

[chequers]

Hi
Looking around on the internet i can see on one aggregate supplier listing it as dust slag 4mm down for patio and slabs
If they are selling it as such shouldnt it be ok

[lutonlagerlout]

chequers its better than nothing but not ideal
carry on at your own risk
but no pro would do it

LLL