I want to use two PP300's for transport and dac...

since Paul McGowan can't figure out how to set values for multiple components in a single chassis. The dac uses tubes and I want to "Voice" it independently of the transport. Is this a waste of time and money?
I have not done what you have done, but have run a Tubed DAC along with a non-tubed transport on the same P300 and found the improvement to be essential. No longer can I run my gear w.o it.

I went ahead and got a P1000 and power all my gear with it

If you have the money, it is worth a try

Shameless plug---If you are looking for a P300, mine is for sale since I got the P1000