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Lime is the most traditional option for raising soil pH, and it would be preferred over wood ash in your situation because lime doesn't contain potassium:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/adding-lime-to-soil.htm

The two most common types of lime are allowed in organic farming/gardening, but slaked lime and burnt lime are not considered organic:
http://organicgrowersschool.org/1027/ask-ruth-types-of-lime-how-to-use-them/

Seaweed does help with soil fertility and is great for plants:
https://www.gardeningknowhow.com/composting/ingredients/composting-seaweed.htm

This article discusses organic options for adding nitrogen:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/nitrogen-plant-fertilizer.htm

The research shows you should allow fresh wood chips 1 year to sit before using in the garden beds as mulch.
The wood chips are very acidic (a ph down around 4), and borrow nitrogen from the soil while it decomposes.
Both of these issues can be a problem for the growing plants.

Compost the wood chips and turn the pile a few times a year.

I would suggest using other organic material to amend the soil.

Here is a few links for you.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-organic-material.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-garden-soil.htm

Iron sulfate can be applied every 4-6 weeks, until you've reached the recommended amount to add to your soil, or the recommended pH.

18 inches is a lot of leaves to add by themselves. Leaves are heavy in carbon, and adding large amounts will deplete the soil of nitrogen, so a nitrogen source should be added to soil or composted along with large amounts of leaves:
https://www.gardeningknowhow.com/composting/ingredients/browns-greens-compost.htm

I would recommend only adding 2-3 inches of leaves to the garden at a time. You can either use this as mulch until spring then till it under, in which case it will suppress weed growth, or till it under now, in which case it will break down more quickly (especially if it's shredded first) but won't suppress weeds.

Vermiculite can compress after about 2 years of use in soil and lose some of its water holding capacity. Any vermiculite which has been stored in its packaging and has been kept dry should last for years.

Any sort of compost that has been properly broken down (decomposed), is moist (not soggy or dry), is spongy, and has a pleasant, earthy smell will do as a compost for your roses. If you don't already have some homemade compost, buy some garden soil (that specifically says it has compost in it) to use in your container.