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Your next expenditure should be a new camera , the filters can come after that ( eg Optolong L Extreme OSC narrowband for all Nebula )
As far as belt modding the the HEQ5, I agree with Ryan, however if your using the Redcat 51 for the next few years I wouldn’t worry too much about super tight guiding as the Redcats 250mm focal length shouldn’t pose too much of an issue with star shape due to FOV , resolution and image scale.
Some Cmos cooled colour cameras for consideration -
ZWO 533MC. Sensor 11mm x 11mm 4.76um pixel size
ZWO 183MC. Sensor 13mm x 9mm 2.4um pixel size
ZWO 294MC Sensor 19mm x 13mm. 4.63 um pixel size
ZWO 071MC. Sensor 23mm x 15mm. 4.78 um pixel size
Or alternative QHY OSC cameras
Cheers
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