So the Sony UWP-D11 are back on my map, are there adapters for Sennheiser "screw-mount" lavs?
Everything else is way out of budget, for critical sound I work with a sound guy.
You'd have to get your Sennheiser-terminated lavs reterminated. Honestly, I'd stick with Sennheiser. I tested the UWP-D against the G3. While I like the physical design of the Sony system, it's got a higher noise floor that made it unacceptable to me.