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Prior to seeing this I ordered some a15 in 1.2mm which I understand to be the British Standards equivalent. My tubes appeared to average at about 1.2mm thick and I understood a filler rod of <= the size of the tube to be best practice. Going the whole hog to produce a few frames, expecting to get the bug and Building a frame fixture so I should definitely consider integrating back purging into the fixture.
Best bet I reckon just use an er7o. Get used to it and at some point in the future try out stainless. I use 1mm dia, occasionally thicker can be handy but I do all of a frame with 1 u just need to feed a bit more consciously in higher fill areas