Thanks a lot your alert and your help.Good advice already given by many members, but if I could add that if you offer your tortoise a bit of romaine and then when it opens its mouth pop in a morsel of something more suitable or some mazuri, this will help with the transition to a different diet. I've tried this and it works, though sometimes the food has to be placed deep in the mouth or the tortoise may spit it out.
Good luck
Believe it or not I've tried "your" method, but my tort refused to eat! There's an exception to each and every rule: what works with one tort may not work with another.