My thoughts on the mkw-fun candidates

(5)	10.1	DC	dDS		++ Big Nature City v1 (lgmb)
(1)	10.2	nBC	gBC3	++ Castle of Time (day) v1.6 (MEGAKart69)
(0)	10.3	dDH	DKS		++ Desert Cross v1.alpha (FunkyDude15)
                    => Why 0? This track is supposed to be Hack Pack exclusive at its current state (so it doesn't have a DL link).
(5)	10.4	nBC	nBC		++ Horror Mansion v2.4.1a (xBlue98)

(5)	11.1	DKS	DKS		++ Icepeak Mountain v1 (4TLPati & Florian)
(5)	11.2	GV	GV		++ Last World v1 (Sniki)
(5)	11.3	DC	DC		++ Love Beach v3 (SpyKid)
(4)	11.4	nBC	nBC		++ Nightmare to Dream World v4.3 (xBlue98)

(5)	12.1	dPG	nDKJP	++ PMWR Cloud Garden v1.06 (Atlas)
(5)	12.2	TF	MH		++ Tropical Factory v1.3 (Sniki)
(5)	12.3	gWS	gWS		++ Wario's Lair v2 (Thondam, LuigiM)
(3)	12.4	MC	MC		++ Yoshi's Magic Yarn Basket v1 (Cloud Cotni & Trushi)
					=> If included, please use Mario Circuit slot and music, not sMC3. -Author

(2)	13.1	MT	MT		+D Autumn Forest v1.1 (JorisMKW)
(2)	13.2	gPB	sMC3	+D FZ Big Blue v1.3 70% (Jefe)
(5)	13.3	MMM	MMM		+D Bouncy Farm v2 (Pati)
(1)	13.4	gBC3gBC3	+D SNES Bowser Castle 1 v1 85% (ChaosShadow23)

(2)	14.1	BC	BC		+D SNES Bowser Castle 2 v1 (ChaosShadow23)
(4)	14.2	BC	BC		+D 3DS Bowser's Castle RC2 (Ethanmark7199)
(3)	14.3	gPB	gPB		+D DS Cheep Cheep Beach v1.2 (sup3rsmash8)
(4)	14.4	KC	KC		+D 3DS Cheep Cheep Lagoon RC1 (Wexos & Crile)

(3)	15.1	gDKMgDKM	+D N64 Choco Mountain v1 (Yoshidude4 & FunkyDude15)
(3)	15.2	sMC3	MG	+D FZMV Cloud Carpet v3 (Scye, AndyK)
(1)	15.3	gBC3gMC		+D Cyberstate v1.2 (Scye & SpyKid)
(3)	15.4	MT	MT		+D Daisy's Palace RC3+ (Vulcanus2)

(5)	16.1	MH	sMC3	+D District 65 v1 (HelloImYourMind)
(5)	16.2	RR	MG		+D Divine Temple v2.1 (SpyKid & Scye & Filizia)
(5)	16.3	nDKJPnDKJP	+D DK Jungle Tour II RC1.2 (HelloImYourMind)
(5)	16.4	gDKMgDKM	+D Green Loop ×1.3 v1.91 (YellowYoshi)

(3)	17.1	GV	GV		+D Item Fireland (Keiichi1996)
(1)	17.2	nMR	nMR		+D GBA Mario Circuit v1 (rca42623)
(3)	17.3	MG	MG		+D Misty Ruins v1 (Vulcanus2)
(3)	17.4	dDS	dDS		+D Moonlight Downtown BETA (WiiLuigi)

(5)	18.1	nBC	GV		+D Pipe Underworld v1.21 (BigOto2)
(4)	18.2	gMC	gMC		+D Punch City II v2.11 (HelloImYourMind)
(3)	18.3	gSGB LC		+D LEGO Racers Imperial GP BETA+ (Segatendo)
(5)	18.4	RR	RR		+D DS Rainbow Road Beta5 (maczkopeti)

(2)	19.1	gDKMsMC3	+D Red Loop v1.91 (YellowYoshi)
(3)	19.2	gPB	nDKJP	+D Rooster Island v1+ (Jefe)
(2)	19.3	dDH	dDH		+D Sandcastle Park v1.1 (SpyKid)
(4)	19.4	LC	LC		+D Sunny Island ×1.5 v1 (SpyKid)

(4)	20.1	aDP	DC		+D Sunset Raceway v3 (Ermelber)
(3)	20.2	GV	GV		+D Volcano Canyon BETA (Multimariokartds)
(2)	20.3	DKS	DKS		+D FZ White Land I v2.1 (Jefe)
(5)	20.4	dYF	dYF		+D Yoshi Mountain v1.2 (ctlgmb)