First question to consider might be why "churn", you have a full service broker so proably better to avoid paying a lot of high commissions here for no very good reason. For do-it-yourself, the new $10 commissions help a great deal in making small adjustments to individual selections, and something like your proposal could make more sense. If your broker has you in say Enterra (I'm trying to think of an especially doggy trust) because say Cramer mentioned it, that's one thing, you should get second opinions, but presumably you have some confidence and can leave the situation for awhile in capable hands. Depends on what portfolio percentage the SDT is now; not much use having just a bit as there is already diversification within it.
Some of us like SDT especially partly because we feel we need some demonstrated management smarts especially here, so it is preferable to some low-MER combination like
T.XTR (large caps, so large weight in energy royalty trusts) plus
BTH.UN (equal dollar weighting of the 100 largest income trusts, http://www.bromptongroup.com/funds/bth/portfolio/ )
But the payout amounts might tend to lag the news, based on results from some time back, and so on, lots of little details that could be thought about. It was the opposite awhile back, some thought the 2006 payouts based on earlier realized gains was set. On the other hand, EIT payouts have been frozen as to 7 cents per month, giving some instability of unit price prospects.