Send an ad-hoc WOL packet without depending on binaries

Under a VPN exist a variety of machines that have their mobo's WOL protocol enabled. With that said, I wish to create a script that creates a WOL packet that can be sent to a specific machine of the network without depending on any binaries (e.g., etherwake or wakeonlan). One can easily implement the code required to generate the byte-stream of the magic packet after reading the respective paper [[1] ] but I do not have the knowledge on how to transmit/send the packet from inside the VPN network. So in the following scenario:

+---+  +---+  +---+  +---+
| A |  | B |  | C |  | D |
+---+  +---+  +---+  +---+      __   _
   \______\_____\__VPN__\______(  )_( )_
                              ( internet)_________ +---+
                              _(__)_(_)_           | W |
                                                   +---+

With me having remote access (e.g., via ssh) to either of the machines of the VPN and saying e.g., that I am in the machine D which can see the rest in the local network, how can I send a packet to wake machine B for instance (once again, without relying on any kind of software/library) ? Thank you in advance.