updating "self" in RELENG_13

I have an endpoint where interfaces come and go or change IP addresses 
due to dynamic IPs being handed out.  One thing I noticed is that if I 
want to make use of the "self" keyword, the automatic table that it 
abstracts away does not get automatically updated with new IP 
addresses.  If I manually do a pfctl -f /etc/pf.conf, it fixes the 
issue.  So to automate it, I looked at devd to create

% cat /etc/devd/interface.conf
notify 0 {
     match "system"        "IFNET";
     match "type"          "(LINK_DOWN|LINK_UP)";
     action "/usr/local/bin/interface-change.sh $subsystem $interface";
};

and in the script I call /sbin/pfctl -f /etc/pf.conf

But the next issue I ran into is the interface often comes up before its 
given an IP. So to make it work I had to add a

sleep 5 ; /sbin/pfctl -f /etc/pf.conf &

Not really happy with this method as sleeps are a bit hackish and 
probably wont reliably work.  Anyone else run into this issue and how do 
you work around it ? Or am I approaching it the wrong way ?

I also noticed that if I do something like

  ifconfig lo0 192.168.99.2/32 alias

devd does not fire

     ---Mike