[skidlids]

Tim
Good question and it is a grey area, collecting points in two seperate championships in the same race and possibly hoping to pick up more than one trophy in the same race. Which I was told wasn't going to happen.
But its been happening in BSB where EVO class riders collected points and Trophies in both Evo and the Full on BSB Class

Sounds like your bike spec is going to be Supercup spec and therefore also Comply with Class1C, as such I can't see how you can enter Supercup using a Class 1C Number with the different Background Colour as Class1C is a higher Spec.
Really you should be entering Supercup and then registering with DD to run in Class1C but would have to use the Supercup number board backgrounds
Standard Practice is for bikes to use the lower class background. At the TT my R6 ran in the Junior on its Production Class Numberboards, there was no way they would have let us run Junior plates in the Proddy race

Renewing your DSC Membership @ £25 and Registering for DD @ £20 gets you into Class1C Championship
Joining Hottrax @ £30 and paying the race entry gets you on a grid that will be shared with a least one if not both of the Hottrax classes.
But to register your number for a Hottrax class sounds like its going to cost you more

But they are Dave's Classes and his rules so what he allows is up to him

Last time I discussed these Classes with Dave at Hottrax he wasn't sure on how they will line up as that depends on the level of interest.

Options are All 3 Classes on one Grid if numbers allow
And if the numbers are to great for one grid

Then depending on Class Numbers Class 1C has to alternatives
Race alongside Supercup or Race alongside Superbike

So What Race you enter on the day isn't yet certain and could even possibly change from meeting to meeting