I think you'll have more success with bass pres than guitar pres as the higher high end content and harmonics generated will likely sound very harsh and unnatural as a guitar speaker actually cuts a lot of top end, contributing to making our guitars sound as guitars as we know it.
I know the Britannia has a low pass filter at the end of it but don't know to which degreeit does tame the top end should you go straight into a PA or mixing desk for recording. Perhaps it could be worth adding a switchable cab sim (ROG's Condor seems to get high praise and the ROG name is one we've all learnt to trust anyway), to make it suitable as both a pedal and a DI'd amp sim?