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Stuffing TXT messages in DNS queries inside DNS queries tends to be quite slow.

Yes but at times you can actually receive data normally it just that sending it will be blocked. So download bandwidth is MB/S and upload is relly slow. Some times port 53 to anywhere is available so you don't evwn need to tunnel over dns.

If your firewall doesn't let SSH go through, step1) different port like 81, step2) udp tunnel like openvpn (pick your port, SIP sometimes work), step3) tcp inside ssl tunnel on port 443, step4) http tunnel on port 80, step5) dns on port 53

Don't go to step5 if anything else work because yes, it's slow.

I don't use ICMP but some people do.

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