You can possibly get your HDUP shares unrestricted.
Look into "SEC Rule 144". You may need to pay some money to a broker which specializes removing restrictions on stock.
The conventional wisdom is anyone who's held restricted shares for a year are eligible to have them unrestricted.
I don't know if HDUP must approve the restriction removal or not... but... if you've been a long term investor there's no ethical reason they should refuse.