Dennis, from my experience the deep-draft H25 is what I call a hellandback boat, because that's where it'll take you. Expect heel angles of up to 22-25 degrees when it gets gnarly out. This won't quite reach the deck. All my dad's boat's heel; but compared to being on the Alberg boats of the late 60s and early 70s, at least you're still sailing dry.
I am not a great fan of using epoxy to set the keel, as it's very brittle, particularly WEST system. It's meant to saturate wood (hence its name), not to bond two relatively stiff surfaces. One great whack at the forward end of the keel and the whole seam will be wide-open. This is why 5200 is best for this: holding power (at which it is superb) and flexibility (at which it's pretty good above about 35 degrees F). Now if you had levelled the top of the keel, faired the bottom of the boat, added a little 6" 'glass tape here and there as needed, and then refitted the keel using 5200, you'd have something. Let the epoxy provide a surface, but not the holding power itself.
When you do open the seam, don't panic. Sand, solvent-wash, trowel in 5200 with a putty knife; paint over. And sleep easy.
On my boat I didn't trust the 'glass in the bilge because the boat had been wet once. The moisture meter, applied to the outside of the bilge, showed only a little, which I believe was either resin or dampness of bilgewater (the day I checked it, I didn't even go inside the boat). So I stopped worrying about it. When I remounted the keel I made backing blocks of G-10 for the four main bolts (the big ones) and a triangular one for the forward bolt, which is under the greatest tension when you whack a rock or hunk of iron underwater. The main bolts' blocks are two stacks with a narrow canal down the middle to allow bilgewater to flow to the pump. The forward one's corners were ground down to make it more or less level, acting as a filler of the wedge shape just forward of the bulkhead. Needless to say both of these are set in a mass of 5200. I made sure to add masking tape to the bolt threads (which is still in place) to keep the 5200 from sticking to them; if it had, you'd never be able to torque them again, which I did 2-3 times since resetting the keel. For the smaller two bolts I got made a trapezoidal plate in SS, like a washer for two bolts, since they're too close together and regular washers and flat washers lap over each other. For all the others I used really big fender washers and locknuts.
My cousin Lee said, 'Locknuts?' like this was a madcap idea. Then some machinist stopped by and reminded us that locknuts, contrary to many beliefs, are no weaker than other nuts-- they are taller because the nylon is added to, not replacing, the regular meat of the hex nut. Any properly-fitting hex nut or locknut will hold the tensile strength of the bolt threads. (I mean, duhh! --that's what it's for.) I chose locknuts because I don't want to worry about vibration (or rock strikes) shaking them loose.
I don't apply a torque wrench to these. My brother Steve the musician/woodworker/Italian-car mechanic was fixing a Craftsman lawn tractor with a Craftsman torque wrench and well before he got to the specified 19 ft-lbs the bolt snapped off in the cylinder head. I tend tighten things to an appropriate degree of 'unnngh!' (grunt). That relies on what my brother Adam the engineer/woodworker/German-car mechanic calls my good sense of mechanical sympathy, which (though I seem to have it innately) can and should be learned by anyone doing his own work on an older boat. Listen to the material and the tool. It's not you-vs-them; it's a boat. If you think you're fully in command of her, you really don't understand her!
I am with you on keeping the interior stock and just making a few 'modifcations'. When I first embarked on this project I had plenty of time and money and really thought I'd get something really cool out of it. Now I just want her back in the water and heading south. I'm not going to promise the cool cabin table is going to be finished or in place by the recommissioning party next summer. But come August I am out of NJ!