I think the main question is how much compatability between the first version and the new one. If the parts are not and the spare for the first version are discontinued then the rules will have to let you make your own replacements. It would be ok if it is just the servo tray as all the rules would have to say is something like from plywood of a set thickness to a set pattern.
I know the switch has been moved inboard with a bit of wire to operate it. If they stop supplying the replacement rubber cover for the originals once again the rules can be changed to say a replacement can be used from this model of this manufacturer. I can not see them changing the rigging.
It's if the new hull gives a performance boost that will be the main problem
Only working from pictures of the new version, but it seems that the new servo tray is actually two separate trays side by side. The mounting screw holes are different; this could be more of an issue than first expected if looking to fit the new trays in the previous hull. Issue with getting the centre 4 screws secure in the hull that is very thin at that point; also the rudder servo position has changed I believe, maybe requiring realignment of rudder link.
Re the power switch. There is no mention of the switch in the rules, however, part of rule A5 states:
The website www.dragonforce65.com includes a Hints & Tips section. These, or any other suggestions posted in the future, are deemed as permitted changes within these rules.And on that page it says:
•Switch 1: Some of these are leaking - loosen screws & seal with sealant then re-tighten
•Switch 2: You may change the switch, but you must use a similar item that fits into the original location and uses the original cover.
The switch and boot are currently available as a spare part of course...