I wouldn't get a head gate where the cow has to close it, I have the Nugent Beef head locking gate here and it's a disaster. @AYF and @headcase have the morris head gate http://www.morrislivestockequipment.co.uk/ it closes in from the side and you can put an extension handle on the crush and close it from behind the cow.
I think one of these would be the ideal, the head gate closes in from the side, the sides of the crush also move in
I would build something like this U shaped one here, holding pens and a curved pen feeding into the crush,
https://iae.co.uk/fixed-cattle-handling-systems-installation-downloads/ or a smaller version
That's my wish list and has been in the planning stages for to long now and am hoping to get the holding pen with curved pen built next year
I must say I like the look of the last video there, the Condon ones are more suited to larger groups i feel. Lot of groups here would be 10 bullocks or less and the most would be 20 so it would be much more suited!