extending a block explorer should not be complicated at all. connecting to a firewalled device is a mess since you’d need a proxy to act as a server in the middle. I can in theory make emergency connections to my device but it’s a big hassle and involves utilizing the i2p anonymity network. block explorer parses blocks anyway so I was wondering that whoever is developing/maintaining the block explorers right now could consider this as an enhancement. if, as you say, it requires “reworking” the blockexplorer then I’m afraid that particular block explorer is poorly designed to begin with.