Inquiry for Costs Associated with Separate Taxonomy - MonotaRO

Matt is speaking with a medium sized prospect in Japan called MonotaRO.

They are inquiring about keeping a separate taxonomy. This is not our first choice but with sales slow we have to consider this. We need some quick estimates on the following:

1) Cost to maintain a sole stack (inc upgrades, QA etc) with a unique taxonomy. Sole stack in this case just means a standard single tenant (but with a separate taxonomy) with planned separation even when we build multi-tenancy.
2) Any other tech costs in maintenance
3) Any tech costs in setup (may be same as other subscribers, so nothing more here?)