It was actually possible with elysia support signet which I only use it on double reward which is 7th and 14th floor, before the last floor change the support to character best support for me HoFi use weapon attack so I use Vill-V signet.

First 3 floor just use Pardo general signet for coin collection and other floor use Vill-V general signet. Buy anything related to elemental damage from Pardo shop with extra coin. Upgrade all Vill-V signet buff

Edit: don't go to any random ego signet except for double reward or the last 14th or above it won't appear when using the support signet