Demetori and Undead Corporation definitely still make metal arranges.
CROW'SCLAW too, although I haven't really heard from Taka recently in terms of Touhou arranges. I just notice that a lot of old bands either don't do music together anymore (Foreground Eclipse, MisteryCircle), moved onto other genres (Draw The Emotional/Yuyoyuppe), or has started to do more original works (CROW'SCLAW doing original vocal/metal works, which are really good btw).
I used to listen to IRON ATTACK! but they started getting stale really fast, and then I dropped them completely when they tried to do their own vocal stuff which I wasn't a big fan of tbh.
Now, if we move from metal to rock bands as well, one band I still very much actively follow is Kishida Kyoudan & the Akeboshi Rockets. In fact, they are still currently my favourite jrock/jpunk band out there. They still do make Touhou albums from time to time, but nowadays they're mostly doing original stuff and anime OPs (ie Highschool of the Dead, GATE, Strike the Blood OVA, etc). They are a really good band and I recommend them to everyone who loves listening to rock in general.