Regardless of the hypothetical chance at penalty for false statement [which I find quite unlikely to even cross an agent's mind], you are setting yourself up for a headache.
Any difference between amounts you enter compared with the CRA's records is quite likely going to flag your return for some additional layer of review. I don't know off-hand if this is an error they would 'auto-correct' for you, nullifying your intent with the added problems caused by maybe giving an agent a headache to resolve it for you. If the error persists on assessment, then you almost certainly would get recognition of the true instalment amounts at some point, but it might require some back and forth to get it straightened out.
It isn't clear to me whether the CRA would initially 'rollover' your current year overpayment to cover off an underpayment from the following year. If they charged you interest for lack of payment for the following year [by 'missing' this rollover], it seems quite likely that after asking nicely with a letter, you could have that interest revoked in light of your current year overpayment, but that would definitely be more of a hassle than just receiving a refund and then making next year's payment per usual.
Do yourself a favour and set yourself up with auto-deposit with CRA, and getting your refund will be painless.