A very basic hack could be to pipe the output of the RPC calls to a simple HTML file. For example getinfo command:
{
"version" : 100000,
"protocolversion" : 70002,
"walletversion" : 60000,
"balance" : 0.26397973,
"blocks" : 345815,
"timeoffset" : 0,
"connections" : 8,
"proxy" : "",
"difficulty" : 46684376316.86029053,
"testnet" : false,
"keypoololdest" : 1397008447,
"keypoolsize" : 100,
"unlocked_until" : 0,
"paytxfee" : 0.00001000,
"relayfee" : 0.00001000,
"errors" : ""
}
Then have a cronjob to run it every x minutes etc. Have another cronjob just before to remove the old file and create a new one with the HTML3.2 header. Probably you'll want to put it all in one script. It won't look pretty, but the info is there.
PS: Picked HTML3.2 because the specs say: