You will not be able to see any tags on the ppp packets leaving $LAN, because wrapping them in new headers means that, as far as the firewall is concerned, that they are completely new packets.
The best you may be able to do is recognize the ppp packets by their type and destination. Perhaps looking at the ppp packets leaving on $LAN (using tcpdump) may tell you how to recognize them, or, conversely, someone with more knowledge about this may come in later.
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The only dumb question is a question not asked.
The only dumb answer is an answer not given.
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