Safe to install OTA after downgrade?

I made the mistake to install the new stagefright fix OTA on my rooted XT1095. Of course this made my phone stuck on boot. I was able to fix my phone by flashing this stock rom (Thanks AGISCI!).

I would like to return to 100% stock now by installing the latest recovery image provided by Motorola (L-5.1-LPE23.32-21.3 TMO) and than taking the stagefright OTA. Would this be safe without a chance of bricking my phone? My understanding is that I would brick my device by flashing an older modem version on my phone. Is there a way to find out what modem version my phone is currently on?

Thanks for your help!