The Bank Reform Party just seems to be a rather expensive way of having a whinge about the banks. They bemoan the lack of competition among the big 4, high interest rates (despite interest rates being very low at the moment). They want to promote more competition by encouraging non-bank lenders.
Another fun idea of theirs is to place restrictions on the terms lenders can offer to borrowers to make them less strict on borrowers. Now for a group who are concerned about interest rates, forcing banks to take on greater risks, to which they will respond by raising rates, is of course a good idea.
They don't seem to actually be running any candidates, so you don't have to work out where you need to rank them. For me they'd probably be near the top of the bottom half. Nothing to really vote for, but also nothing bad to make me put them near the bottom of the list.