Stefan.
instead of useing the slow sd card slot on a laptop.
just make sure you get a laptop with spare usb ports.
THEN just hook up a very fast external solid state drive over usb
eg
https://www.newegg.ca/External-SSDs/SubCategory/ID-2022or put a nvme or m.2 in an emclosure and hook up to usb.
small enough to carry in a pocket etc. eg
https://www.startech.com/en-ca/hdd/sm2ngffmbu33the startech above is vedry fast 5gbps.
the KEY is a laptop with spare high speed usb ports.
NOTE i dont like huge 4tb drives. too much data to loose.
better to use multiple drives.
another idea is , if you have old pg usb drives you can use those also.
best
oldmuso