Broadback wrote:

I am looking to edge a footpath bordering on soil. all the ones I can
find seem to rely on spikes going into the ground, sadly this is not
possible in my case.

The reason is that there is concrete at the
edge of the path, so impossible to insert spikes.

Could you use construction adhesive to stick the edging to the concrete?

e.g. https://www.ct1.com/our-products/ct1