Exploding dice and rerolling.

I am in charge of a game which uses an exploding dice system which does not seem to be supported on roll20 by default. Maybe I'm just stupid, but I just want to see if you guys can help me figure out if I have just missed something.

In our game we are using d6's and upon rolling a 6 we first explode it and then reroll all 6's.

Example:
Rolling 1, 3 and 6. I would then remove the 6 and instead roll two new dice. If any of the new dice ends up being a 6 we would do the same again.
e.g. 1, 3 ,6 -> 1, 3, 5, 6 -> 1, 3, 5, 2, 1 -> done.

Is there any way to make this work using the regular rolls? I came close with /r (3d6r6)! which explodes the sixes and then drops 'em but I would like to reroll them instead.
If not I have made a quick and sloppy api script for this but since I'm so shitty at css it doesn't look very good in-game. Is there any way to make a custom roll appear like the ingame ones? 

I don’t think I this is possible with the dice syntax, API script is where I’d go too. 

When you say “appear like the in-game ones” are you talking about the /r output or the inline roll output?  Either way, the answer is “pretty close”.

I was mainly thinking of the /r output or something similar at least, where I can see how many "6's" that were dropped and so on. 

It’s probably easier to just have an output that shows those things, rather than duplicate what’s output. I think I have a few scripts that are close, I’ll take a look in a bit...