Yeah, that is going to be complicated. Are you putting a jib on it too? not that you asked, but might be a problem with loading up the bows with a forestay low enough to get the jib on. Will pull the hulls in too much. May need a bow foil... but I digress.
The 59 isn't accurate for full on HTs either!
Get it out and do some speed trials against a known DPN boat and see how it plays out. In the end you will probably need to bargain with the race committee. I don't see it as a huge problem with maybe local club racing but it certainly would be if you had some high maintenance competitors around or if you were racing the boat in an Alter Cup qualifier etc. In the end though, people who have been more involved with RCs would be better to chime in (JW, JK, etc)