PreAmp for Ibanez SDGR Fretless MIJ 4 string

Greetings fellow TB'ers

I have this active SDGR Fretless ( s/n F917813 ) that I have had for longer than I can recall.
I also have 2 Fretted Fender Jazz Basses, one passive 75 RI CIJ Natural and one Standard Jazz MIM with an Audere JZ3 post fitted by myself.
Anyways, I was 'noodling' the Fretless SDGR today and thinking maybe this would sound better with a modern pre amp.
Not sure if that should be an On board replacement or a Pre Pedal or rack unit even that would add Tones and Color for my Passive Jazz as well.
I'm playing with a Markbass CMD 102P Combo right now but looking to get a separate light, class D head also. Genz Benz ShuttleMax 12.2 or the like. Cabs is another journey

Any thoughts or experience out there on upgrading the SDGR Onboard Pre Amp or alternative GAS type behaviour ?

Cheers
Rob

 

I suppose new pickups is another possibility. I know little about this Axe. Is it all it can be and not worth tinkering with perhaps ?