Though the forum allows the use of alt accounts but however I don't think building a new account is necessary inasmuch as you keep a good reputation and get reliable trust from users in the forum. Sometimes, I do imagine how some persons manage two accounts like isn't it obvious that you would find it stressful to be using multiple accounts? Well, since the forum allows it and you feel you can get alt account without breaking the rules of the forum then it may be okay but for me, I would build my account to the legendary level and become a DT member.
People have different reasons for having alts, some members are even open about their alt accounts. This is what Theymos thinks of alt accounts:
I don't have a problem with alt accounts as long as they're not used for evading bans. If you're hesitant to say something controversial because you don't want it to be associated with your name, please create an alt account and say it.
There was a time a tried opening account for a friend and I was asked to pay an evil fee then I was like what? So opening account for someone using my device means an committing evil? Then I got to know that inasmuch as I've used my device to open my account that I can't open another except I pay the evil fee and I just declined that I don't want to commit any evil in the first place; lol though I don't really know if there is a way to bypass paying the evil fee.
I haven’t tried it before but I doubt that’s how proxy ban works. I guess you didn’t read any of the above replies. Anyway you can avoid the evil fee, you can use a vpn or point your friend to this thread to get whitelisted:
https://bitcointalk.org/index.php?topic=5350260.0