Fogie,
I am extremely familiar with the cliffs above Chapel Pond and with the Trap Dike.
There are a host of cliffs and steep hillsides above Chapel Pond. The are a variety of gullies and routes that might be amenable to a "bushwhack - scramble" approach, and I've also thought it would be interesting to approach Round Mountain that way.
However, I recommend against attempting to "hike" up the Chapel Pond Slab (as it's known to climbers), as opposed to treating it as a rock climb.
The Trap Dike route, including the slides above the Dike proper, are variably rated 3rd or 4th class. 3rd class is steep scrambling, where some hand holds need to be used. 4th class is the same thing, but with exposure sufficient that some parties need to use a rope for safety. These classes describe the Trap Dike well.
The Chapel Pond Slab is the nice clean slab that is so attractive, just South of the Pond. It is approached by a short walk through the woods, just South of the bridge over Dipper Brook.
All of the routes on the slab are true rock climbs, with 5th class ratings. 5th class is defined as climbing where a rope, and fixed belay points, are required for safety. The most popular routes on the slab are in the 5.5 - 5.7 range, meaning moderately easy to intermediate rock climbs. There is a 5.2 route, which would be considered an easy rock climb, but it is quite difficult to find. Also note that the easier pitches are down below, and the climbing gets a little harder near the top. It is more difficult to climb back down then it is to climb up.
Experienced climbers, who are using climbing shoes, and who know the routes on the slab well, routinely climb most of these routes without a rope. However, it would be EXTREMELY ill advised for an inexperienced climber who is not expert on the routes on the to start up the slab treating it as a hiking route.
The slab routes are beautiful and enjoyable! You should round up a rock climbing buddy who doesn't mind bushwhacking, and do the trip. Climb the slab using proper rock climbing practice, and then bushwhack up to link up with the Weston trail. Sounds like fun!
TCD