You should not have any problem installing a Jewell trigger. I have put them in two Blue Label rifles, both with sear blocks, without difficulty. I have no experience with the safety.
As far as removing the block, there is a hydraulic method that has been posted here before that works quite well according to those that have tried it. Sorry, I do not have the link for the post. It still requires a drill press, some basic machining skill and a careful operator.