Tommee Tippee Groclock Sleep Trainer Clock & Night Light - £9.99 @ Aldi Greenwich

We have one. You don't configure it every day. If I remember exactly, only if you unplug it will forget the settings. I do prefer something with batteries.
However, your setting is better. Our kids lamps are not smart, so we use them dim and whatever colour we want. But we can't set up different settings. We keep them purely because the kids don't like pitch black in the room. I like the fact I can use them with power banks, something you cant do with this clock.
I've recently purchased a Govee lamp to set a system similar to yours. But I concluded I will keep the lamp for myself😃. (edited)

Should try combo it with a reward scheme. Our 3yr old gets a sticker on a chart each time she stays in bed until the sun comes up on the clock. After 7 stickers she gets a present.

Has worked really well so far

Yes sorry late posting

Wish it had worked that well for us. Our son would wake us up super early then want to go back and check his clock. 😜

You must have the original model as I can unplug mine and it keeps the settings. Not sure how long it does off of power but certainly enough to move it to a different room.