You did a great job of it!I filled it with plasto sanded it a bit and layed down a filler primer on that section and some plasticoat. Seems really decent and should hold up.. I took to it with my nails and a set of keys.. it's on there good... I did debate trying to match the grey but given it would look just bad if I got it wrong I thought black looked the obvious choice.
I actually own it now as i traded it for a fully working not damaged machine so and am only into it a relatively small amount it owes me about 60 quid.
Tbh it's a shame you can't buy lynx shells but I guess they are a bit niche