As I mentioned in your other thread, I do think that doing a short (3-6 month) certificate 3 to become an AIN first would be a good option, for a few reasons.
1) 3 years is a big commitment - and I would hate for someone to commit and then realise that it isn't for them
2) it's a nice introduction back to study iykwim, not hard, bit cruisy but still has deadlines, classes etc
3) you will definitely be able to work as an AIN, no debate
4) it will count towards your uni application, so you may not need the vet assess thingo.
Just my two cents.
I'm an EN, studying my RN. By doing the AIN>EN>RN route, I've added a year to my degree (EN diploma takes a year off the bachelor) but I've been able to work the whole time and I've really got a good grip on things as I go if that makes sense - so things like showering, giving meds, making beds, time management, communication - none of this will be an issue when I finish uni because I've been doing it for years.
Hope that helps, feel free to PM if you have any questions
ETA - one downside of doing it this way. Because I have a stable job that I'm happy with, I don't have that 'push' to finish that I used to iykwim? Past few weeks have been busy busy busy and I've been thinking occasionally 'but I have a job, do I really need to keep going?'. Just a thought if you think motivation may be an issue