example.sh

#!/bin/sh

./trans.py | xclip -selection clipboard

xclip -selection clipboard -o | ./read_stdin.py
# 0x1f3f3
# 0xfe0f
# 0x200d
# 0x26a7
# 0xfe0f

read_stdin.py

#!/bin/env python3

a = input("")

for i in a:
    print(hex(ord(i)))

trans.py

#!/bin/env python3

emoji_style = "\uFE0F"
zwj = "\u200D"

flag = "\U0001F3F3"
flag_emoji = flag + emoji_style

trans = "\u26A7"
trans_emoji = trans + emoji_style

trans_flag_emoji = flag_emoji + zwj + trans_emoji

print(trans_flag_emoji)