Casing for round hole?

[Wabblan]

I am interested in finding good suppliers, solutions for casing/cladding a round opening (for a spiral staircase).
It's about a casing for a round opening, approximately 1300 mm in diameter.
The thickness of the floor structure will be approximately 300 mm.
I am considering a casing in MDF, wood or other suitable material.
White lacquered or untreated, preferably in one piece.

Gratefully receive tips & recommendations, thank you in advance!

 

[Kane]

Would this work? https://www.trabutiken.se/shop/bojbar-mdf-16469p.html

 

[Wabblan]

Would this work? [link]

Thanks for the suggestion! Could be an option, I spontaneously think that this solution would need to be complemented with a strip that covers at least the top/joins to the parquet, as well as filling/painting.

 

[Kane]

Thanks for the suggestion! Could be an alternative, thinking spontaneously that this solution might need to be complemented with a trim that at least covers the top/joins with the parquet, as well as filling/painting.

Routering a divided ring-shaped L-strip from an MDF board? Is the hole sufficiently circular?