Just to clarify, anyone can work on any watch they want to...in fact you don't even need to be a watchmaker, as in most countries it is not a protected title or occupation. In the US for example state laws mandating that watchmakers are licensed was successfully challenged in court decades ago, so watchmakers are no longer licensed in the US. Pretty much anyone can hang out a shingle and start repairing/breaking watches, whatever the case may be...
There are no watchmaker police making sure untrained or uncertified people are working on specific brands. The issue is access to parts to effect repairs.
I'm on vacation so can't confirm but I don't think the crystal you have bought is sapphire, as those usually have SA in the part number rather than SN.
You mention that you don't know how this would void your warranty...well if anyone but an authorized Omega service centre works on your watch, it will void the warranty from the service that Omega did, and this is pretty much standard across the brands in this industry.
Cheers, Al
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