I dive with a wireless (nice to be able to see the pressure on my wrist, nicer to be able to log and analyze my gas consumption) but I'm not comfortable with the lag time the wireless has and have had occasional issues with synchronizing the Tx/Rx so I have an analog backup on the system. I understand the concern you have and only see two solutions:
- Replace the regulator with one that has two HP ports.
- Ditch one of the SPG's. If you only have room for one, keep the analog.
I'm not familiar with any HP port splitters and wouldn't use one even if I did.