From reading what you have, your setup will not work the way you want. The SVR200 is meant to mate with a high powered mobile radio for use with hand held radios. The configuration would be a VHF mobile mated with the SVR200 uhf vehiclar Repeater. You would then use UHF handhelds to communicate with the vhf mobile.
A security company that I used to work with used to use 2 motorola mobiles with a motorola based patch panel that allowed the mobiles to cross band repeat.
But, in your configuration either using a motorola brand unit or using the pyramid unit you will need at least convertacom to connect the handheld to work with the pyramid unit. But, why not buy an inexpensive mobile radio to connect to your vehicular repeater this would help inprove the reach of your radios. But, in determining your needs a UHF vehicular repeater will require UHF handhelds to communicate with it.
If you need any further info, let me know and I will be more than happy to give your further info.