Think about the calculation of an insurance product with a Fund Value. Everything is forward recursive with respect to time. Been a while, so I might butcher some of this. It is likely that you'll want a 30 year projection, so you'll call fundValue(30 * 12)

fundValue(t+1) = if t > 0 fundValue(t) - charges(t) + intCred(t) else initialPrem

charges(t) = netAmtAtRisk(t) * costOfInsurance(t) + riderCosts(t) + policyFee(t)

netAmtAtRisk = (FaceAmt - fundValue(t))

Now think layering on decrements

surrenderMargin(t) = lapseDecrement(t) * (surrenderCharge(t) * fundValue(t))

mortalityMargin(t) = mortalityDecrement(t) * netAmtAtRisk(t)

investmentMargin(t) = (earnedRate(t) - intCred(t)) * assetBase(t)

Now think layering on calcs necessary to calculate the assetBase (e.g. reserves + required capital)...