Yes, they'll work with Motorola systems.
List price (with some work, you can purchase for less than list price)
NX-5400 full keypad 700/800MHz 3 watt portable $875.00 (standard keypad is $825.00) includes analog and NXDN Type C trunking.
KPG-D1NK programming software $155.00
KPG-36XM programming cable $158.00
KPT-300LMC license manager client -free- required to add licensed functions below.
Required for P25:
KWD-5100CV P25 conventional $575.00
KWD-5101TR P25 Phase 1 Trunking $520.00 -requires KWD-5100CV
KWD-5102TR P25 Phase 2 trunking $400.00 -requires KWD 5100CV and KWD-5101TR
Required for radio:
KRA-32K 700/800MHz Whip Antenna $35.00
KNB-L2M Li-Ion 2600mAh Standard battery $135.00
KSC-32 Rapid rate single unit charger $70.00
P25 Phase 2 would be pointless since without the system key, you won't be able to program your radio for that. There may be some work around, but I've never heard one one for these specific radios.
Remember that "list" prices are just a suggestion. You should be able to get it for less than list. Under state contracts I purchase under, we get 30% off list. As an individual you probably won't be able to do that.