You could share the 12volt power for the sensors, but suggest the keypad use a separate cable.
I would not suggest using cat 6 data cable due to volt drop and the long distance but using 14/020 security cable in 4 core or 6 core
eg 2x 6 core for
1 cable for 12v and alarm contacts for 2 PIRs
1 cable for keypad and piezo siren
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