Convert Exe - To Shellcode

So, how do you bridge the gap? How do you take a structured Windows EXE file and turn it into a raw block of executable memory?

: A tool by hasherezade that converts a PE file into a format that can be injected and run as shellcode while remaining a valid PE file. convert exe to shellcode

However, if you are a malware analyst or a CTF player looking for classic, small, assembly-level shellcode (like execve or MessageBox ), you are better off writing it manually in assembly or using msfvenom with standard payloads. So, how do you bridge the gap