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The fact it's a convertible valve shouldn't make it any more difficult to fit an A-clamp over it. All valves on the market today are convertible. When my TX100 was A-clamp it fit on convertible valves no problem.
Are you sure the insert is screwed right in, and the A-clamp screw is right out?
Check the valve neck for a pressure rating - it's not unheard of for oddball valves to be put on cylinders. Mate of mine has a 232bar pony with a 270 bar valve on it. It's a complete sod to try and fill it, the A-clamp insert is too short and neither of our DIN whips will fit (232 is too short, 300 is too long)
Failing that, Mark's advice to swap to DIN isn't a bad idea. Or if you're determined to stick with A-clamp, you could get the valve replaced... but it's REALLY weird that you can't fit it on..
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