I used to pull wlp001 from the bottom of a dish bottomed tank for repitching after 3-5 days successfully for up to 12-15 generations - we needed to over oxygenate a bit, but always had plenty of yeast. A 45 degree cone would have been a dream. You may have difficulty getting all the yeast out of the tank for proper conditioning- we used to transfer after primary. If the price is right I'm sure you could find a way to make these work. Plus it's a wacky looking tank and everyone loves breweries with wacky looking tanks.
Evolution Craft Brewing Company