ProLine used to make thumb screw body mounts for the SCT410 but they discontinued them, I felt they were a must as I lost body clips all the time and never lost a thumb screw with the PL mounts.
An alternative is to use clip retainers:
https://www.amainhobbies.com/dubro-...GLOXTCZABLKNBNziupUvsEUBDSz2F3r4aAorLEALw_wcB
I did not care for velcro straps either and that was a major reason why I left TEKNO in favor of HB Racing kits which use a carbon battery strap with thumb screws to secure the battery. I don't experience premature internal wiring issues with my batteries anymore since I ditched the velcro straps.
If SCT were to make a comeback in my area, I would probably do a conversion with an old E819RS in similar fashion to what this guy did here:
https://www.rc10talk.com/viewtopic.php?t=34603