The use of HDPE sheet should be great...ICE AND SNOW or most anything else will not stick to the Poly.
I used the 1/4" HDPE sheet in the tubs on my Transfer dump truck/trailer to protect the aluminum floors from wear...plus the sticky stuff would slide out easily.
A carefully placed piece of the poly sheet will wiggle/flex enough that most snow and ice should just fall off.....at least between the track and the sheet...
An aluminum angle frame around the poly sheet and then bolt the sheet to the frame should work.
Depending on the size of the span you might want to add a support especially where you will be stepping.
The 1/4" poly is some tough stuff and bolts are not going to tear through it.....
https://www.warnerplastics.com/hmw_natural.html
These guys offer HMW and UHMW ......Back in the 90's I used the HDPE as the better stuff (HMW and UHMW) were not available in the sizes/rolls needed.....
UHMW is a common wear/slide bar material