Why do you consider it a risk to give out a single private key for a single address when you say its not risking the other addresses? Electrum wont use an already used addres out of its own. And new addresses should be safe.
About the clams claiming trough just-dice.com. It is just plain stupid if you do that. I find it even tricky to do it trough the wallet. But only address which are filled at the time they get funded got their CLAMS and that was last year ago. Just send your btc's to a wallet which do not have unclaimed CLAMS before you claim your CLAMS.
I claimed then through just dice. It took some time because electrum isnt made for it but i found 6 + 10 addresses containing clams. I then imported these single private keys into jd. When youre right and the other addresses arent compromised then it should not be a problem isnt it?
Or do you speak about the amount of work? Yes, thats no fun but i wondered and though i should have a couple one. I think i found more than i awaited.
The wallets arent really used anymore but i still wonder why you still see a risk.