4e Style EOT Condition Marker Removal

I run a long standing DnD4e campaign (I know, right?) and I have had things nicely modded and things run great, but I've been racking my brain on a simple, no-brainer system for keeping track of conditions that cease either at the end of the inflictors turn. Is there an elegant way to track this that I've missed? To make this clearer, a lot of powers will give, for example; -2 to all defenses until the end of the casters turn. So a monster hit by that power will have that -2 until the end of the casters next turn. It's one of the easiest things to forget in combat, and I'd like assistance with a solution for keeping track of this. So far, the best I have come up with, is using an afflicted condition status reminder script that notifies with a line of text at the beginning of a turn. The script that handles that does work, but I want to know if it could be done better easily. Can anyone help with this?

I was going to recommend looking into something like the OnMyTurn script, but then read in the end of your post that you are already doing something similar. I think what you're doing is likely the best approach for this platform. The biggest trick of course is remembering to apply the buffs/debuffs on other people's turns! Btw, not to get off-topic, but congrats on your long-running 4e game! I don't play it any more, but I loved its well-defined mechanics and interesting powers for all classes (not just casters). Never understood all the "flavorless video game" hate. We all still have imaginations, right?

Thanks David, I appreciate the thoughts on this. 

Don't know if it's an option for you but my group do this with tooltips through a macro command. I had some help on this a while back. !token-mod --set tooltip|"@(selected.tooltip), ?{New tooltip content}" command run on a selected token adds a comment onto an existing comment in the tooltip box so conditions can stack up. !token-mod --set tooltip| command run on a selected token clears the tooltip box. Once it comes round to the tokens turn hovering over the token shows the tooltip text. There can still be a bit of remembering duration's etc but this works really well for my group. I think you only need Token Mod API for this. Hope it helps

Small Correction: You also need the Metascript Toolbox (in addition to TokenMod) for that. Roll20 doesn't expose the tooltip to chat constructions -- you're getting it by using a Fetch construction (part of the Toolbox).

I'll try adding this and see if it's workable, thank you both. edit - It's a solution, it works. Still have to remember to hover over a token, but that's a step in the right direction.