Skip the hack saw and solder on your barrel lugs! You then only have two rather shallow dovetails to cut for your sights...
I've been doing that too. I used to dovetail & softsolder them into place. Typical overkill on my part.
Then I talked myself into just dovetailing.
A thin waisted swamped bbl got me thinking about just sweatsoldering them and that's where I am now.
Maybe I'm getting lazy!!
With a large contact base and a good sweat solder job, things aren't going anywhere. It's holding up a forearm weighing a few ounces to the bbl w/a pin after all. If the wood doesn't give 'way before your soldering job in some case of extreme stress,,then the soldering job was no good to begin with.
See,,,you can talk yourself right into it...
Forend lugs, sling swivel bases, sights and all sorts of small contact items are held to cartridge bbls w/soft solder that have much more force applied to them. They hold up fine,,as long as the job is done right!
Makes wondering about encroaching on the bore with the dovetail on a thin tube un-necessary.