The anti-glare is definitely worth it and it’s also very noticeable outside. The other option is that you could just upgrade the screen from ifixit if you’re also going to be upgrading your storage anyways.
All versions of the deck allow you to upgrade the SSD. There’s actually a lot more vendors selling 2230 nvme drives now. I’d recommend staying away from SABRENT Rocket since their support is nonexistent and they also have a high failure rate. The Corsair MP600 mini and Micron 2400 is a better option.
An Aeropress, Moka Pot or a Vietnamese Phin Filter are other cheap alternatives to try. But if you’re overextracting in a French Press you might be doing something wrong with the brew time and/or the temperature.
It’d also help to know how darkly roasted it is and what type of beans they are.