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Mike .. I am a bit wary of supplying Volts to IC pins with no or floating GND. these modules have a LDO regulator not sure how they behave with no gnd, also TX RX can have voltage on them directly into the wireless IC...
Could have been better laid out ,but splitting the HC-05s from the processor was major re-jig.. result lots of wires and connectors.. time now for 'C'. I still
have 97% program memory of the 512kb to play with ..
It seem I'm not as smart as I thought I was... the BT slave was going to be controlled by a PIC12 ... but 8 pins ..make debug difficult , moved up to PIC1814K50 20pin .. lots of mem EE and features... got as far as making the SOIC BOB and PIC board and some code only to find you cannot De-bug this chip with PK3 ..(fail) ( need a debug header ) so now new PIC in place is 18F14K22 . Then problems preserving the Data EEprom , this chip uses the top end of flash memory as Data EEprom , I understand the programmer has to first read the EEdata portion, erase the flash then writes the EE data back, and flashes the program , but telling the PK3 the addresses to save is problematical .. settled for the properties as below..BT master and slave now messaging and paired .