I don't own the exact TPA3116 amp but the platform used with TPA3116 is very effecient and powerful for its size.
It can replace my NAD302 for driving a pair of my big Sony SS-D201 speakers while providing enough power to drive JVC CSGD-1210 300w subwoofer with a quarter of the power.
They do distort on the treble when I push it close to their promised 2x50W but since you are using small efficient speakers from C3 you'll probably have tons of headroom.

Edifier original amp may be tuned for the speakers but they are not efficient and with EIDC causing distortion, I think you'll be happy with the current chinese amp offerings.

And it's half your RM400 budget for replacements so I'd say its quite a good deal to try out. Nothing really can compare to your C3 with RM400 now other than downgrades

As for if it sounds good or not? I'm not sure. My TPA3116 amp didn't sound good when I pair with my Edifier S530D with muddy mids coming out from the subwoofer. The amp I linked has a crossover point and it should solve my issue of vocals coming out of my subwoofer. With my car subwoofer I have a passive crossover so that isn't an issue

Overall the fullrange part is pretty okay

I made it my own from scrap wood planks and screwing some cheap furniture legs to it.
It was some roof planks iirc. Not too sure what wood but it's coarse and needed a lot sanding before its usable.