I have an 11l cube which i use for no chill. As my system uses a 19l kettle for mashing and boiling it only allows me to make 11l. I also have a 15l cube. Would i be able to make a high gravity 11l batch and put this into the 15l cube seal and roll it around to sanitize the extra space with the hot wort. Then i would like to top up the 15l cube with hot water to achieve my OG for 15l.