I doubt the aspiration to remove the right to employment tribunals is possible. We now have access to ETs (after initiation of redress) for working time directive breaches ie. more than an average 48 hour week. There are exemptions in the Human Rights Act for armed forces, but for further exemptions, primary or secondary legislation is required - ie an act of Parliament. This can't be done using prerogative powers!
It won't stop them from trying, and it will be overturned in Strasbourg, at a significant cost!
We should assert our rights! For example, the bar on armed forces playing an active part in union membership is cobblers. it may be career suicide, but such prohibitions in QRs don't have a solid legal basis!