The VOR network is conveniently designed around airways on route navigation. Whilst clearly it can be made to work reasonably well for IFR and VFR navigation OCAS the more especially if you have RNAV that is not its ideal purpose. In fact it is often really hard to construct a route OCAS using only VORs without having to factor in all sorts of deviations to avoid danger areas, ATZ, CAS, NOTAM’ed airspace etc. Why would you want to complicate the process if you could keep it simple? In fact I would imagine in IMC this is a better recipe for infringing some bit of airspace that you wished you hadn’t than following the magenta line.
Much better to enter a precision flying event if your chart skills are a bit rusty and you feel you want to brush them up. These events are a great deal of fun and a far better way to see how good (or bad) you really are. Interestingly those who reckon their skills are pretty good, but haven’t taken part before, usually find they are in for a shock!