Soluble support material for PETG - PVA with dual nozzles, HIPS?

I have the H2C and a lot of white PETG for printing most of my architectural models. Many of the models have complex internal geometries, hence the desire for soluble support materials.

I have read that PVA and PETG are not good together, but that they might be OK/usable if using dual extruders/hotends/nozzles.

Also, while reading more about supports, it seems HIPS is a good alternative for higher printing temperature filaments--and I did purchase a lot of limonene--but my research also shows people do not like working with HIPS.

BVOH seems impossible to find in stock and is extremely expensive.

Questions:

1. Does having more than one nozzle at least partially negate the poor compatibility between PVA and PETG?
2. Is HIPS my best option for soluble supports for PETG?
3. Any other alternatives that do not cost >$100 per kg?