EDIT: just checked the specs on YDP-143, and doesn’t look like it has MIDI DIN (criminal for a piano!), but see my reply on your other post
if your piano has a MIDI DIN output, then you could just buy a USB midi din converter - lots available from unbranded ones for $15 to Roland for $30 - these work well, and have two DINS, so you can use for both midi in and out.
this would be my recommendation , at least as a starting point.
you can also get a midi DIN to TRS-A adapter that will work for the organelle-m.
Im slightly hesitant to recommend this, as some seem to have had some issues with some controllers.
but Im sure these will be fixed, and this is a really simple and neat solution
I’ve not used this with my M, as I already had USB->MIDI DIN which i was happy with,
but if I didn’t, then Id have probably gone for a din to trs A
note: in both cases, depending upon adapter you might also need to buy a midi cable.
I can’t recommend a midi controller, I use one of my synths… and the budget area is a bit of a minefield in terms of ‘feel’ but Andrew Huang did a good review recently of budget keyboards.
btw: having some pots on the controller can be very handy with the organelle to go beyond the 4 pots on the organelle. also most patches are velocity sensitive. so that 2 things Id look for.