A Small GUI Linux System with UEFI completely running on RAMDisk

I am developing a POS System and I am planning to use Linux. My requirements are as follows 1. UEFI Support. (Running on x86 and x86_64) 2. No Storage Drive so completely running on RAM and persistence storage data(Around 1 MB) will be in ESP (EFI System Partition) 3. A GUI Application displaying options for POS. 4. Wireless connectivity (Not immediately but eventually) 5. No installation required. (Just copy kernel and initrd images to ESP along with systemd-boot and good to go.) I have been able to run Minimal Live Linux (https://github.com/ivandavidov/minimal) where kernel and initrd images are stored in EFI System Partition. It could connect to Wired Network and I could login to Bash. Next step is to load GUI (XOrg or Something else) and add my own GUI application. I am stuck at a point where I want to create a initrd image with GUI support. Any pointers on that direction?