Soon I need to do the difficult task of splitting up our 3 OSBS gilts,

,2 are going for pork, 1 we want to keep. We recently got 2 GOS weaners that I thought would be company for the OSB. Stupidly, I got boars as i wasnt even thinking of them getting randy at an early age, I think robert said they might try it on at 3 months?
So will I be able to keep the gilt in a separate pen next to the boys? Or will the gilt coming in to season drive them mad? They will be separated by stock fencing with a strand of electrric on either side. The GOS are 9 weeks now and will go for pork at approx 6 mo.
The other possibility is that we could take our OSB gilt to a neighbouring farm where he has 2 Kune Kune gilts to keep ours company. But this would probably be quite stressful for her?
Any suggestion gratefully received!