HC-06 Bluetooth interface Signal level issues? Help!

OK, here is my problem, I am using multiple HC-06 or JDY-31 (36) on a single wire buss, thus yes the RX and TX are basicaly shorted together, my problem is that this causes the TTL Signal levels to drop down from 3.3vdc to below 2VDC and the other devices basicaly are looking to 5VDC TTL levels, they do work at 3,3vdc but not at this very low level signal voltage...

I tried isolating my TX using Schotsky diodes, NO GO
Tried using level converters based on BSS138, but when the LV side is this low the HV (5VDC) side is lower and drops to an unacceptable level...
I also tried simple 2n3904 level convertion circuit... no go!

I am loosing it ....

1- what would be the PROPER way to take the RX and TX output of an HC-06 and merge them on a single wire full duplex to prevent then from affecting each other!
2- what other options do I have to make a Bi-Directional level converter that will take a very low out going signal bring it up to a regular TTL signal (0-5VDC) AND take a normal TTL Signal and bring it no lower than 3.3VDC TTL Signal...

HELP!

thanks

#1 - must you really? Why?
#2 - many versions of level converter are available off the shelf as modules. Perhaps you miswired your module?

I suggest you post wiring diagrams. It's de rigeur for this kind of question...

By the way, bidirectional serial signals on a single wire would be half duplex, not full duplex.