The Tucano idea will last as long as it did last time (armed T-28Ds in Vietnam), which is until some talented Dead-Eye Dick figures out how to teach his buddies to hit it. (It won't shoot anything bigger than a .50-cal at the outside, and as the adage has it, if the enemy is in range, so are you.) Bang, bang, and now Woopert on the ground has no CAS and two hostages to worry about.
It was interesting even that CGS even mentioned the Super Tincanno - presumably some eager RAF staff college report must have caught his eye. But Super Tincanno still falls into the category of lengthy procurement time, expensive, and large log tail - albeit a bit less than FJ.
If you wanted to go further down the food chain, you could actually look at the mighty AAC Defender - already available, decent mid-level loiter time, and can (you might laugh) carry up to 1100lbs of external stores on wing hardpoints, including cannon-pods and rocket launcher pods, as well as kit to serve in ISR/comms role during loiter, plus flexible enough for other roles too.
Another step down (and bridging the felxibility gap with UAVs - albeit cheaper) could be the DA42M, with which can carry stand-off hellfire missiles, and has a mid-level loiter time limited mainly by pilot endurance, and virtually no infra-red or radar signature. DA42M also much more reliable than UAVs, and has genuine all-weather capability.
They're cheap and evidently capability-handicapped options compared to the full-monty RAF fantasy options which we can't afford - but perhaps they could at least provide some sort of round-the-clock cover until Apache can arrive.