That's entirely workable. Yes, you can incorporate the LBRP into the Grove ritual; instead of tracing a circle around the grove from east to east, go to the east, do the Cabalistic Cross there, then trace the pentagram in the east and proceed around, doing the closing in the east as well. Then purify with water and consecrate with fire as usual, proclaim peace to the quarters, etc. Do the same thing in the closing; instead of unwinding the Grove, perform another LBRP.

Do the supplementary gwersu in the Bardic grade still give the traditional rituals?