I wouldn't touch the average taiwan coilovers for b road use.
Main issue is stroke too short travel for rough roads and valving pretty poor whiich further reduces traction on the rough stuff .
If BC would custom make longer body with twice the stroke travel and longer springs based on 70mm standard it would be probaly road use decent with bit of spring rate/main/tender tuning.
Best I had on road off shelf was japan ohlins, bilstien inserts are superb too (used in budget rallying) and what I current use as our roads are junk .
BC is affordable and kind of half decent but in my opinion from using it on rough roads is it not great even with revised spring rates for reason mention above, all the taiwan coilovers pretty much same issue with too short stroke and not most amazing of valving to cope with high spring rates on rough B roads .
Is a tough one get right without going custom or getting BC make a better rough road designed package .
Handling and braking is 2 of biggest weaknesses on the R thus biggest gain your money can net if done well to match your usage, brakes pretty easy sort , handling more tricky but good effort on struts bushes swaybars alignment and likes of modena front diff can make them hang on with evo level of grip