I think a sub 60 right now might be asking a lot, but I would certainly think a PB is on the cards. You’re in a similar situation to me in that we are both probably not quite able to keep up with the pacers. My approach is to start close to the 40 min pacer (my PB is 40:55 and if I run a really good race I might have a chance) see if I can stick with them for 2km or so, to bank some time, then slowly ease off and let the me pull away a little, so I can save some energy for the last few km. I think a similar approach for you with the 60 min pacers could be the best strategy.