Since you can't wear the 070, Safariland has a new holster out that might make the cut. The new Raptor series. It comes with a removable SLS device. It can be configured into different levels, up to a level IV. It should ride like the 070, a mid ride so it won't wear on your shirt.
It really sounds like you need to do some basic research. You make it sound logical, and show the current number of officers killed with their own firearms. You then point out the current trend in litigation, failure to train/equip. If your department is only allowing inferior safety devices to be worn on duty, they are setting themselves up. Not only to get someone killed/injured needlessly, but sued.
If they are not allowing the state of the art in officer safety devices, you might point out to them, with tact, that they are setting themselves up.
Until then, you need to be practicing holster retention. Good luck, been there. We were issued the Top Gun when we went to the Beretta 92D because they were $3.00 cheaper than the 070!
When I worked out the trade for Glock 22/23, I made damn sure I got to order the 070 for it.
It's a matter of penny proud, and pound foolish.