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@PhilDAS are you concluding that putting a flat bar on the stem from a pre 2017 M type would be terrible? Asking as the one I'm acquiring is of that type and that era, and I was thinking of chucking a flat bar on.
If it just ends up a bit shorter in reach that's probably fine for me. If it makes the handling to all rubbish then that's not great. But my guess is either way it'll feel like a small wheeled weird bike so whatever.
Cupcakes-
I found the combination of short reach and seat-to-bar drop too much to be comfortable, but that probably depends on your height. I replaced the flat bar with a Joseph Kuosac midrise which brings it up to the level of an S bar, it's much more comfortable.
I have a fairly chunky light on mine and have had no contact issues whatsoever. If you're worried get a smaller light like an IQ-XS, but I wouldn't be concerned.
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I wouldn't be able to say but that seems to be the consensus online. I think it might be a bit twitchy but if you're not tall, maybe it's fine? Idk.
I've bought a flat bar and I'm going to chuck it on the Mtype I've just bought but I'm confident having measured the stem to be similar to the S type. (It could even be an S-type that someone in the past has put M bars on, who knows)
IrPOWERranger
PhilDAS
To part answer my own question, because I couldn't find any info online at all, I just measured.
A post 2017 M-type stem has the same reach as as the S-type at 220mm from the front axle. Not the 251mm the M-type used to have pre-2017:
I've also measured the height from the ground of the clamp and it comes out around 92cm so it's either exactly the same stem or very close.
So I'm going to go ahead and flar bar swap. Or possibly slight riser.