Consistent Time to COB Indicator — Ahh... Try this one, it should do pretty mush what you want I think: (Script / EA)

World clock — (Not sure what COB is. Or if this is useful to you at all.) Anyway this clock dose not relay on incoming ticks for update, so somewhat smother then some others. Will display time in the caption also. It's a script. Not indicator. ...

I made a script to do something similar a while ago. (Rearranging the order window to make it smaller) The code is not complete however, (several forms/windows/buttons etc. are missing, look for "unknown" in the source code) as I lost interest in it ...

That dose not belong in the Renko EA. Use a separate indi. on your renko chart instead. Like this one:

This have to be the last one for a while — I wrote an dumy EA some time a goe that just printed a log file with bid ws Close[0] over a couple of hours. It turns out that thay are not always the same if I just uncheck the "offline chart" ...