I think the other issue with the “Knights of Rak” idea is that it may require introducing too many peripheral characters if we have a Ropor, Boga, Oohno, Vohta, Suuko, Keelar, and possibly a Kahga if we include the elite breed. To give a rough idea of what I envisioned a Knight of Rak to look like, imagine something like the old Visorak Halloween costume, but redesigned to look more formidable (Likewise, I also had a sketch attempt where I attempted to make the “Makooti” mask into something that looked intimidating)
I think it would be an interesting idea for Voporak to exist as a pet…maybe he was once his teacher whom he had turned over to Roodaka once he had no further use for him? Then in a karmic twist Voporak fused with Sidorak when he commanded Roodaka to give him more power. I envision Roodaka in this continuity as a Morgan Le Fay-esque character. Your wish is her command, but you must be very careful concerning exact words
I toyed around with the idea of having Matoran coming from other lands before it was established that there are no other islands in canon. Initially they were Pirates trying to appease Tren Krom by sacrificing land masses that they would lay anchor on and pillage. Maybe we could rework ideas from this pitch to rely on the Visorak instead?