Don't have all the answers you may be looking for. The mouth piece caps were soft rubber. The hard cap that goes over the coil is removable. To disassemble to the point to mod it? Seems like you would destroy it to get to that point.
Edited to add: We tried their prefilled liquid, and also added various other liquid to blanks that they sent.
Can you tell us the resistance (ohms)?
If it's 3.0 ohms or greater, can you easily take it apart enough for direct dripping from the top?
I've found the regular Kr808d cartos to be very robust in that I have only had one out of many many burn out. I didn't do so well at removing the filler (and leaving just the sock) for dripping. If these have the same durability in the coil and a regular wick already wrapped around them it might be perfect for dripping
(and my batteries need at least 3.0 ohms resistance).