Najemy, Daniel asked if there were standard connectors.
I have no info for the PIC, but regarding the connector(s)
recommend by Lattice for their in-site programmable logic,
they have two. One is just an 8-pin header on 0.1" grid, like so:

VCC
SDO
SDI
/ispEN
plug    (pin absent, socket plugged, for keying reasons)
MODE
GND
SCLK

There is also an 8-way RJ45 connector with the same signal
order, but this is harder to get and dearer and won't fit
on a 0.1" grid veroboard as far as I know. Might be a
neat way of making these signals available to the outside
world without having to take lids off equipment.

They publish a circuit for driving these signals from
an LPT port.

I may be wrong, but I thought I saw they had changed this
to a 10-way header (much easier to get and attach to an
IDC ribbon cable). I think I saw this in Elektor magazine.

BTW, the Hitachi micro uses UART style serial signals, so this is better
driven by a COM port with some of the handshaking signals used to switch
the other programming signal levels.