You have a couple options. First for the lockdown bar, just get the pinball life bar and the matching lockdown receiver and you're set there.

For the coin door you have to decide what you want to do. You can leave the plastic parts black and that actually looks pretty good. Especially if you leave the bolts that hold the coin door black and get black leg bolts.

The other option is to use a powder from say cardinal as they sell touch up paint cans that are a perfect match for their powders. Then you can just paint those pieces. I've done it both ways. Here is a blue coin door powder coated leaving it black as I suggested. In this case, it stands out with the plunger tip.

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The new Happ doors in my opinion up close don't look good powdered in anything but black. The old WPC doors were smooth and cleanly pressed. The newer happ doors that both stern and jjp use are rough and not uniform in look and texture and powdered in bright colors it stands out like a sore thumb. And of course the coin chute issue. Ask Mark said you can try to paint them but if you get into textured or 2 stage powders you will never find a paint to match. Only solid RAL colors can truly be matched with paint.

Here is another idea for the door. Just do the frame.

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I think the black coin chutes add the needed contrast.

Does the Iron Maiden pin have it's own thread?

https://pinside.com/pinball/forum/topic/rolling-stones-to-iron-maiden-project