I would also make the observation that the IPFire Core Team is small and with all the work required on IPFire 2.x to fix bugs that are found or deal with security issues that are discovered, they are already struggling to work as much as they would like to on IPFire 3 which solves some of the infrastructure problems of how the core part of IPFire was originally developed.
So to have IPSec, OpenVPN and Wireguard in IPFire someone needs to step up who has the programming skills and can create the cgi screen and make wireguard work in a secure way in the IPFire system and commit to supporting that package on a long term (multi year) basis otherwise the resources would need to be taken from somewhere else.
So if there is someone out there who needs to use wireguard and has the programming skills required to create the IPFire menu cgi page and the interaction with the wireguard program then I would suggest they should join the Development mailing list and offer their services.
https://wiki.ipfire.org/devel/contact
https://wiki.ipfire.org/devel/mailing-lists