OK is a good solution.

I haven't JDM programm all the suggestion are welcome but I prefer that JDM works with ICProg (I see some solution but I don't know the best) . Now I use stand-alone P16PRO with ICProg and LPT connection and is OK.

The JDM works olso with LVP setting ?.
If YES the connection circuit is it the same ?
I don't know if PGM pin must be connect to JDM pin