Well, here's something that might comfort you a bit.

A lot of people give their plants veg nutes the first 1-2 weeks of flowering anyway to help them grow a tid bit more.

As far as the incremented nute-ing goes, a lot of people check out the contents of flowering nutes and then go to Home DePot or Menards or a greenhouse and get "Slow Release" fertilizers that, either by themselves, or by mixing a couple, will slowly decompose and release gradual nutrients into the soil.

If you are going to use more than one kind of slow release fertilizer, keep these things in mind:

1.) Do NOT use two fertilizers that already contain trace amounts of micro nutrients. Micro nutrients are finnicky and there is a reason why they like to exist in very very small amounts. Don't over-fertilize micro nutrients.

2.) When in flower, plants like more Phospohorus and Potassium than Nitrogen

3.) When using slow release fertilizers, you don't have to worry about overfertilizing and burning your plants, as long as you aren't doubling up on any nutrients when using more than one kind.

So yea, I hope this was helpful bud

Cheers,

SMG