> will a 2.2M ohm resistor cause problems ?

Yes. It can pass only

I = V / R = 5,000,000/2,200,000 = 2.3uA

You'll see in the datasheet that pin leakage is +/- 1uA, so a 2M2
resistor is as near as dammit letting it float

An internal Port A pull-up's current is 400uA, equivalent to a 12k5
ohm resistor (R = V / I = 5,000,000 / 400)

If you've no resistors between 1k and 100k you'll have to turn the
internal pull-ups on and use Port A pins for the switches

BCF OPTION_REG,7 or

BCF OPTION_REG,NOT_RABPU (?)

Note : this also turns on a pull-up for /mclr
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