How to export or display capture traffic in this format? - Ethernet II excluded

Well, wireshark (with >2million lines of code) is a bit overkill for that, why not use a simple perl script:

#!/opt/local/bin/perl -w
use strict;
use Net::PcapUtils;
use NetPacket::Ethernet;
Net::PcapUtils::loop(&process_pkt, FILTER => 'ip proto 1');
sub process_pkt {
my ($user_data,$hdr,$pkt)=@_;
my $eth=NetPacket::Ethernet->decode($pkt);
if($eth->{type} == 2048){
printf "%s\n", unpack("H*", $eth->{data});
}
}

which gives the following output (for a ping to 8.8.8.8):

450000544f3d00004001599fc0a801150808080808006e73b68e00005199293100006d3008090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f3031323334353637
45280054000000003201b6b408080808c0a8011500007673b68e00005199293100006d3008090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f3031323334353637
45000054e97400004001bf67c0a801150808080808006e28b68e00015199293200006d7908090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f3031323334353637
45280054000000003201b6b408080808c0a8011500007628b68e00015199293200006d7908090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f3031323334353637

I’ll leave the proper filtering and layout enhancements as an exercise for the reader :-)

I guess by going to File -> Export Packet Dissections -> as Plain Text File. Then on the "Packet Format" pane uncheck everything except "Packet Bytes".