Can I study tajweed at the local Islamic center if they bring these "Islamic motivational speakers" that I've heard the scholars warn against generally (so I haven't heard anyone being warned against by name). Also they do some acts of bid'ah like group dhikr (but they do it in lectures rarely)

Ustadh AbdulAziz al-Haqqan

No no if the teachers are engaged in bida' no. Online u can learn from salafis we have sheikh Abdullah who teaches quran online and he is with us in sok. Contact the admins in sha'a Allah.