Been using a VROD for years and never have issues getting the nut off. If it's warm and you didn't cross thread it, it should come off fairly easily with a pair of pliers. I use pliers that are flat and covered in silicone, not really pliers but they work. Sometimes it works its way undone by itself, but I see that more often with the quartz dish than SiC. I put a ton of concentrate through mine and have no issues. That inner head area will not get dirty either because the heat will not allow the vapor to condense on the inside. Even after years the inside of my head is like new. But cleaning that thread is not something I have ever done. Remove the SiC dish and blast with a torch til red hot if you burn some stuff inside it, good as new. You shouldn't need to unscrew it otherwise.
Also, Ti is fairly soft, it's not some indestructible alien technology. Steel is harder so you will especially mess up the finish on Ti using steel tools.