Wine staging now includes a patch which allows the 64 bit client to be run under linux via wine.
The needed patch is that one: https://github.com/wine-compholio/wine-staging/tree/master/patches/ntdll-Grow_Virtual_Heap
The bug was reported here: WineHQ Bugzilla – Bug 40858 – Stonehearth ( 0.17.0, develop 3023): 64 bit version crashes on startup
Despite stating that the problem is not being able to allocate more than 32 GB of RAM, the issue was preventing Stonehearth to run in 64 bit mode in general.
My PC has 8GB RAM and after applying this patch wine finally launches Stonehearth in 64 bit mode, which was not possible before.
So for now one has to compile wine staging to use the patch, but it should not be too long until a new release of wine-staging with that patch included comes around the corner.