I’d keep your ambika as it is, for the sole reason that there are very few of them carrying those polivoks filters.
For softer sounds there are lots of options. Micromonsta is one of them. Or PreenFM2. Or even Bastl Xor, though those little boxes have become even more rare now.
If you care, i got the Shruthi-1 Polivoks for 7 months now and got contaminated by a sort of psychological obsession for M.I. since.
So, i got myself the Ambika with 6*SMR-4 one month ago : i love it !
But, instead of saying it’s ok i have one shruthi one ambika, i accepted a yellow magic LP2+delay in a trade two weeks ago, supposedly to run my monosynths stereo, which is a good idea as both filters are the dirtiest around. I love it too !
But then, i have seen a Pharmasonic Kochab XT for sale in my area (Dual SVF shruthi XT made in Japan) priced like a normal shruthi so i bought it too. I love it and can’t stop experimenting with the many knobs. In my home it’s a real 90ies rave my friend.
Parallel to this, as if it was not enough, i spent my last money on an Anushri to replace my monotribe & minibrute i had sold to make room (isn’t it irony ?) and also to finance some other gear. I have a few other synths too but start getting quite M.I. oriented.
But hearing the Anushri from vids on youtube here and then, i started realizing how much i love the monotribe-like melancholic sound of the oscillator. So i had to get one though i have quite enough synths to work on.
That’s my story i bought all of them ready-built; spending most of my time to learn how to make them work and make nice tracks.
My advise, if you should take it into consideration, don’t sell your ambika, you’ll regret and never find one again. Then, the SMR4 are really, really beautiful. I know many people, even its conceptor, think it was crap or not as good as braids or stuff, but believe me, it is not. People around me who know not a shit about synths were blown away by the sounds i get from those boxes. And i"m also only scratching the surface.
The Micromonsta is monotimbral. Maybe consider a Pharmasonic Pherkad loaded with SMR4P, they go for cheap.