For the instrument LEDs, you may have to try and cross-reference some LEDs with a different color/output. Sounds like a trip to an electronics parts shop.
You'll have to disassemble the instrument panel and de-solder and re-solder the replacement LEDs.
Or, replace the panel with a used one. Try Ben at RC51Parts.com to see if he has one.
Easier to swap it out then waste time tracking down semiconductors and potentially ruining the board during the solder process.
As for the trunk lock, I don't think you can change the lock to fit another key.
I suggest you look for someone parting their bike out and see if you can grab the ignition switch, trunk lock, and keys.
Then all you have to do is order the special bolts for the ignition switch, or just replace the bolts with 8x25mm flanged hex bolts.
I recently lost my key somewhere, so I had to order the lock set kit, which comes with ignition switch, trunk lock, two keys, and special bolts for the ignition switch.
It wasn't cheap, plus I have to remove the current special bolts to swap the ignition switch.