I generally use altars to get +align. Getting -align is easy enough. Digging graves, or killing beggars after they give up a potion of booze. (I know, easy to do other things, but these two can even be beneficial). If no L altar is generated I usually make myself L at some point using amulet from sheriff, and convert at least one altar to L.
To get L+ for the crowning I use blessed amulet of order (it will take time, just do something meaningful meanwhile) unless char is level 35+, in which case either healing pets or self-flagellation is employed. Healing pets is very good, especially if you do it next to Jharod the healer, and char to him every now and then. (You can take a high-HP pet, get it very hurt in ToF or water cave, then lead it to VD:4 for the healing). Hawkslayer, or simply a SoFS-pet.
Self-flagellation might not work if natural PV (from talents or Toughness) is too high, but remember that rings of doom give -6 PV. Two of these might be enough.
Oh yes, I always save the Lawful quests for this time too. I never tell girl about dog & give her corpse until I need to for a crowning. I also do not talk to village leader after saving carpenter either (I already get healing from Jharod, so this only lowers food shop prices, not very useful). Killing Kranst Nief also, always save till later. Hotzenplotz is usually killed early on so I get amulet quickly, though.
ADOM General's warning: Treasure Hunting causes slowness, frailty, terrible markmanship and is dangerous to your characters' health