Should work fine, but I would replace the 12A circuit breaker going to the light with a ceramic fuse, and add a cool 12v 20a toggle switch. https://www.amazon.com/Nilight-90014E-Rocker-Toggle-Warranty/dp/B07QKFD7Z7/ref=sr_1_3?crid=22TXLXXCSKSF&keywords=automotive+switch&qid=1656374950&sprefix=automotive+switc%2Caps%2C86&sr=8-3

https://www.amazon.com/5x20mm-Holder-Inline-150pcs-Assorted/dp/B07F8RLMPB/ref=sr_1_15?crid=2ZSRLUIK6EK6P&keywords=10a+fuse+holder&qid=1656375254&sprefix=10a+fuse+holder%2Caps%2C89&sr=8-15

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You should have another fuse between the battery and the Ebike controller (unless the controller has one built in).

https://www.amazon.com/InstallGear-Gauge-Line-Fuse-Holder/dp/B01CT4ZJHS/ref=sr_1_10?crid=2ZAA51COQLY6U&keywords=150%2Bamp%2Bfuse&qid=1656375014&sprefix=150%2Bamp%2Bfuse%2Caps%2C76&sr=8-10&th=1

Also I'm not sure what you are bolting the Ferrule to, but you should take a look at Bus Bars for connecting everything together. Most can be bolted directly to metal frames, and they keep everything neat and organized.

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Does the Ebike controller act as a battery charger, or are you using something else for that? I'm assuming you have LIPO batteries, so you might want to isolate the Ebike controller with a switch when charging, due to you needing a higher voltage differential. It might not be good for the Ebike controller to have a higher voltage feeding into it. If the controller has a built in battery charger, then there's no need for this.

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Also note: you probably would have gotten more support from r/ElectricalEngineering because this is electrical related. But you should add a link to what Ebike controller you are using, and battery for better support.

Looks like a standard slide switch. If you measure its dimensions you can probably find a close enough match on amazon

Or you could take the awesome option and replace it with one of these: https://www.amazon.com/Nilight-90014E-Rocker-Toggle-Warranty/dp/B07QKFD7Z7/ref=sr_1_4