Thank you for this answer.
I was currently making some calculations on how to do this kind of witness rewards but I was quit confuse on how convert SP to Steem and I end up with only one solution : You need a tone of Steem even before starting the Witness.
As you have a old account it seems that everything will go well.
Is it possible to contact you in private somewhere ?
Sure! Just send me a private memo like described here:
https://steemit.com/steemit/@adept/tutorial-how-to-sent-and-recieve-private-encrypted-messages-on-steemit