Spare and off-cuts stair-nosings from “Bamboo Flooring Company” [I found them great for solid bamboo/wood flooring]. For 1cm thick flooring, or the F1037 range at https://www.bambooflooringcompany.com/solid-natural-strand-woven-125mm-clic... and the nosings at https://www.bambooflooringcompany.com/natural-strand-woven-bamboo-10mm-stai... Some have some imperfections [pictured] but not that bad, purely dye under the lacquer, and can be cut out as follows.
1. 110cm, with imperfection but fine for 90cm.
2. 91cm with imperfection but tolerable and in any event fine for 66cm.
3. 64cm in good condition.
Shame to waste these. The imperfections are in the dye only. The long one was worth circa £20, and the shorter ones worth circa £13 so was worth circa £46 before cutting, all solid and sound.