If I dive both a BC and drysuit I can do the following:
If using a DH with a hookah port, route a LP hose. Use a three way adaptor for more LP hoses.
If using a Mistral, use a pony with a LP hose routed to the DS. Orally inflate the wing/horse collar. Make sure you practice this before jumping into the deep end of the pool.
Route more LP hoses off the pony if you want to power inflate everything. Should not be necessary but may be required on some charters.
If you don't want to use a J valve:
For Long Yokes, I use a banjo adaptor to attach a HP hose.
For short yokes, I use a Dacor tank valve that allows a HP hose to be attached directly to it.
I just posted a discussion about drysuits here if you want to read more about that:
viewtopic.php?f=4&t=7266
Here's a pic of me with a slung pony. It doesn't need to be cumbersome: