While you say that you don't have the necessary skills, you don't say that you are unwilling to learn them. I am pretty certain that if you take the www/apache22
port as a basis, read the change-logs from apache2.2 to apache2.4 and apply them as necessary you will at least get partial results. Then you can share your work with other people, and you will see that someone will be willing to help you with the remaining portions.
It is always a lot easier, and also a lot more fun, to help people who have tried to do things themselves first. Not only are you then teaching them something, but they also have a much greater appreciation for the amount of work that goes into doing something.
Just give it a shot. Worst case - it doesn't work. For me it seems that the default instruction on http://httpd.apache.org/docs/2.4/install.html
work quite well for FreeBSD, ie it builds without obvious errors. This means that you are already quite close to having a working port.