I wouldn't worry too much, I don't know how Araldite Rapid Ceramic & Glass performs over time, it may well be alright. Yellowing/ discolouration can take several years to show. For particularly valuable items I'd recommend using a conservation grade epoxy such as Hyxtal NYL-1. It is fairly expensive and difficult to work with as it's not sticky like a glue, you have to support the item with an adhesive tape or similar and apply the product with a syringe, allowing it to wick into the cracks.
If sending a piece to a restorer, it's worth checking what adhesive/ filler they will use. I've seen several bits of Lalique with what were supposedly professional repairs where the resin used to fill chips has discoloured over time.