How much work would it be to get an updated block explorer?
I am not really sure since I haven't done it before. I wouldn't think very long since the code is all open source (maybe 1 to 8 hours depending on how smart you are with servers and cryptocoin technology). I have no idea which hosting company would let you host this sort of thing for free and anonymously or I might try to do it.
I believe these are the best block explorers but please list others if you know of some:
http://live.insight.is/ << open source code available, link on the right side column. Looks amazing to me, especially with the qr code scanner. I would love this for hempcoin! Looks like it uses a lot of server resources and may require someone to pay for a server every month. (Maybe if everyone asked hempcoin.org nicely they will install this version on hempcoin.org). These things are security risks to have on the same server as other things so maybe they will have to get another server and use a subdomain like blocks.hempcoin.org.
https://en.bitcoin.it/wiki/Abe << open source very light weight, compared to insight, block explorer that works great but would require a new UI skin.