Rebatching using a plastic bag.
I used the type of bag that is used for oven frying. I figured it could stand the heat. I wouldn't use a regular plastic bag for this, I'm pretty sure it would just melt. I put the lumpy lavender coloured soap in the plastic bag, tied it close and put the bag in a pot with hot water. With the top of the bag sticking out I let the water come to an almost boil and then turned it down to very low heat, left the soap there for a while and forgot about it, accidentally. When I came back (I think it was 2-3 hours later) the soap was very nicely melted, but it had turned brown. Hm. Not what I intended. I was sad to loose the nice lavender colour, but at least the scent was still there. I couldn't do anything about the colour so I figured I would go with the flow and make cup cake soap. I squeezed the soap from the plastic bag into a bowl and used my electric whipper to whip it up. I then spooned it into a cake decorating bag and piped it into muffin forms. The rebatched soap was very smooth with this method, but not really quite firm enough to make a great whipped soap. It is better to do that from scratch. I haven't done that in a long time, but might just give it a go again soon. Especially since I need some way to rescue my rather dull rebatched soapmuffins. They might look ok if I could get a nice fluffy white top on them.
But anyway, there are two lessons in there. The first is that Alkanet doesn't like heat. This actually corresponds with my experience that it is better not to heat the Alkanet infused oil, but add it to the other oils. The second lesson learned is that the plastic bag method workes great. It's easy to get the soap into a bag, it doesn't have to be finely grated, just not in big chunks and there is no need to sit and watch the pot, the soap will just melt nicely in it's own good time. There were no lumps or bumps and I'm sure that the soap would have been fine poured into a mold. So this might just be the easiest way to rebatch.