Merging Magento installs to storefronts

We currently have 3 separate Magento 2 installs, (1+1+2) 4 storefronts. I have a crazy notion of merging them all into a single install so we can reduce duplication of work, upgrades but is this more trouble than its worth?

I can see migration of data becoming complex (different product ids, customer ids, order ids) and I can see the increase in complexity (code, managing the store, testing changes) as potentially wiping out any benefits. Have any of you attempted something like this?

submitted by /u/deyterkourjerbs
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