I admire your courage , this is not a cheap light ! My first thinking was to say : leave it as it is !..., but then I remembered that I saw some videos where were applied different techniques to remove the bezel and the switch ring , as follow :
Using a sharp blade and a wooden hammer , try to separate the bezel from the body , by going in a circular movement...You'll need a vice , with wooden protections to hold the head steady.The bezel is fit pressed , so , patience , go around as many time you can , in order not to scratch the body...
By breaking the tir optics ,and force the bezel from inside out . But only if you can find an other optic for change...
Once inside , you'll find that the led is glued on a piece of copper , fitted inside the head, so changing this is gonna be a PITA !
If you want to get the driver out you'll have to push it from inside , carefully ,not to break some smd components. Taking the driver out is not gonna help you too much , there are no room for modding , because this light is already working VERY hot , the internal heat protection is kicking somewhere between 85 to 90 degrees celsius !!!... But if you want to fit an other driver , and a new led , this should not be a problem...
I don't remember where I saw this , but spending some time on Google should lead you to the videos. Personally , I'll never try this , on a light of this league and well made.., if you want a better version , they are available !
So , think twice ,and if you decide to go for it , we'll be very interested how the things turned out ...!!! Here , on BLF , nobody tried this (or I do not know about...), we are all "budgetary"...