Issue with that is the other nearby TOCs do all have some schemes like that. Most people - rightly or wrongly - go for the money followed by the roster, routes and commute. The first is poor under SE, 2nd depends on your depot, the 3rd is not great either (although the competitors are also all DOO metro-style services), and lastly most depots are within spitting distance for comparable TOCs.
Not saying that more can't be done and the ideas are sensible but for qualified drivers, I can't imagine many will be incentivised enough to switch for the reasons you mention.
I wasn't aware other TOCs already had similar practices, I know a friend at Southern had the devils own job getting them to agree part time, he had to find someone else to agree a job share and even then it was under duress and a 3 month trial. The poster above mentioned ASLEF and I wondered to what extent Unions have inadvertently played a part in making flexible working difficult. Theoritcially there should be a reasonable amount of flexibility in working patterns within the constraints of the timetable. Obviously the railway is never going to be a workplace that can cater to everyones needs, the needs of the business will always require cover at particular irregular times but I do think in this day and age more could be done. I have to say if there was a TOC out there that offered continental hours, I'd be 1st in line for recruitment. I personally love shifts and don't have a probel with early starts and late finishes but I hate getting into the routine of earlies then having to switch, it feels like I'm in permanent jet lag, a change through the week with my shifts getting later is much easier for me to manage. I get way more sleep but everyones circadian rhythm is different hence the suggestions at looking at a variety of shift patterns to suit.