> ICSP works, can I get away with this ?

It depends on the programmer. I have three - my original and
vintage PICStart+ and two of Olin's (Embedinc)

Olin's have much better drive and are designed for circuit loads
and will programme a chip when a PS+ would fail. Before I had
Olin's I'd make the PIC switchable, isolating the relevant pins
from loading the PS+

http://www.piclist.com/techref/microchip/picstartplusicsp.htm

/mclr (Vpp) and Vcc are also involved in ICSP so you have to be
aware of those loads and whether your programmer can power a
whole circuit, including dealing with capacitance etc

Joe


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