Anyone have any ideas of rooflight / Part K situation?

[GEO-PAR]

I have a roof terrace at the back of my new build. Next to the terrace I have a rooflight providing light into the deep plan space below.  The issue I have is that I both don't want and am now unable to put a gaurdrail up along the edge (upstand is only blockwork and is not all waterproofed).  However I understand from Part K this required.  I am going to enquire about making the glass 'walk-on' but have a feeling it's going to massively increase the price to the point I cannot afford.  Anyone experienced similar and keen to know how you got over this?