I’m going to stray from the consensus.
It’ll be fine, loads of front end grip and the Ralph does find surprising grip for the tread.
Cornering won’t be as good as a rock razor and I think the rock razor comes in softer compounds, but tbh while I’d run a hans dampf or nobby nic for a bit more grip in the slop (particularly climbing), I can’t see huge problems happening descending and have run this combo myself (using the old design of RR) due to not having time/inclination to change both tyres, and it definitely had its advantages.
The lack of tread is really hard to get clogged up too, although this is a bit theoretical pub chat rather than practical guidance.