Since you haven't got any other answer yet, I've thought I'd ask perplexity.ai, and I got:

Based on the information provided, it appears that port forwarding and setting up a fixed IP for your Huawei E8372 4G dongle is not possible. This is because cellular networks typically use NAT (Network Address Translation) and do not allow direct incoming connections14. To enable incoming connections for your Bitcoin node, using Tor is indeed a good alternative. By configuring Bitcoin Core to use Tor, you can bypass the limitations of your cellular network and allow incoming connections without port forwarding2. To set up Bitcoin Core to use Tor, you can add the following lines to your bitcoin.conf file: text proxy=127.0.0.1:9050 listen=1 bind=127.0.0.1 externalip=YOUR_ONION_ADDRESS.onion Replace "YOUR_ONION_ADDRESS" with the actual .onion address of your Tor hidden service2. Using SOCKS (as you mentioned) is part of the Tor configuration. SOCKS is a protocol that routes network packets between a client and server through a proxy server, which in this case is Tor2. By setting up Bitcoin Core to use Tor, you should be able to accept incoming connections without needing to configure port forwarding on your 4G dongle. This setup allows other Tor users to connect to your node, enhancing your participation in the Bitcoin network while working around the limitations of your cellular internet connection23.

I don't know if it'll help. :-)