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Would suggest a native sony lens/mount is a solid bet - I have a 16-70 which is great for a lot of things.
I think adapters in general are a great idea but even the expensive ones aren't completely reliable - I've had fancy metabones ones fail to recognise lenses entirely as well as fail to recognise things like aperture changes or focus so I'd be concerned about relying on a cheaper version professionally. One good thing about metabones etc depending on the model is that you can get an extra stop or two out of it and less crop (by some sorcery).
Audio into the BMD 4K VA sounds like a great idea to me - if it were my money I'd pop the 7D, Tascam and some of the overflow of lenses on eBay and pick up the A6300, a Sony lens and the 4k video assist. Though do note that the XLR ins are the mini versions so you'll likely need an adaptor. Another consideration is that I already have a load of batteries and SD cards so am not factoring that into costs.
4K video assist is 300 quid more than the regular one. If you were thinking of ever getting the K2M module that's 450 quid saved already. Honestly, having a big monitor will make such a difference to your framing/exposure etc especially if it has tools like peaking/focus assist/histo etc. That you can record in a significantly higher quality codec than the native mp4 from the Sony seems like a no brainer (though you'll want to have plenty of storage and presumably not set at the highest quality ProRes). Also not having to sync audio after the shoot is another big win. Obviously go with what's in budget but on paper that's a great set-up. (Presume there's an AC adapter for the Video Assist which may cut down on batteries). You could also look into Atomos but they're considerably more expensive than the Video Assist for all the features it has.
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CYOA
Sorry, ran out of time to follow this up. Again, thank you.
Am now looking for an A6300 on ebay.
It occurred to me I could get the more expensive 4K BMD video assist thing and then record audio via that as it has XLR inputs. But they do seem a lot more expensive. I think for the moment my plan is probably to get an A6300, the cheaper video assist and stick with Tascam recording for moment.
The choice of lenses is a bit overwhelming. I've actually got more Nikon DX lenses than Canon, so I'm inclined to ditch Canon entirely, buy one dedicated Sony lens and then have my Nikon ones for variety. I think just one nice sharp Sony lens would probably be good or moment. Or is there no advantage at all to buying dedicated Sony ones if I have an adapter?