Never ever, ever gear from an indebted position. Quite simply do not use existing debt to finance a leveraged trade,particularly heavily geared trades, well not traditional debt like a bond, at least. You're gambling an existing debt - it's just not worth it, imo.
If you want to play in the margin account business then start small and build your account up. You'll soon realise why not using existing debt was a good thing as your downside potential is substantial, depending on your gearing of course, and the markets you're going to be exposed to will not see you on the upside all of the time. As a trader in leveraged products, I square trades more often than being right, but when you're right you make it count.
If anything, rather move your booked profits into the bond than borrow from the bond to hopefully pay it back, or worse, be subject to a margin call and have to remortgage your property because you were geared to the max. No, thank you...