I suspect you'd have more chance via the CTC ATP scheme with 500hrs - with your multi-crew experience you'd probably do really well. Be about the same cost in the end with 6k for AQC and then reduced pay for 6 months. (Bond-free at the end of the 6 months though as I understand it). AQC is basically the same (but more of) as the Adv Handling Course on TRSS. However, this route will have a longer wait time to being 'called up' and ATPs are much smaller proportion of the total intake for eJ than TRSS.
The people I've seen on TRSS have a lot more than 500hrs but I have heard of those who know someone getting in with TP experience around this level.
Good luck.