There is no issue with MDP2 - it will receive midi status from those keyboards that send it.
Looking at the Alfa Juno manual (circa 85-87), it is pretty early in Midi implementation, so does not appear it has anything like transmit edit, where it transmits parameters on a control or program change.
This is from the era of individual sysex dumps, so to sync parameters after a program change, the MDP2 layout would have to send a sysex request after the program change, then use StreamByter to decode the results based on the sysex table in the Alfa Juno manual.
Ibo Kai's DX21 layout is an example of decoding bulk sysex with Streambyter:
https://mididesigner.com/qa//8308