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It can be pretty hard to get rid of. Hand digging is about the least damaging to the plants method of control.

You can try cutting the plants off at the soil line and then immediately painting the cut on each plant with undiluted Roundup. The plant will pull the Roundup into the root system and this will help to kill the roots.

Pouring boiling water over the area will also help. But, boiling water is like Roundup in that it will kill any vegetation it comes in contact with.

This article should help: https://www.gardeningknowhow.com/ornamental/bulbs/lily-of-the-valley/lily-of-the-valley-control.htm

Good companions for lily of the valley include a variety of spring bulbs, hosta, perwinkle, anemone, forsythia, ivy, ferns, winter jasmine, cotoneaster and weigela.

Many countries have laws regarding the import of organic based products. These laws are designed to prevent plant diseases and invasive species from crossing international borders.

If you are going to buy seeds from overseas, check to see if the company has been authorized to sell to your country. Basically, they would have gone through a process where they are certified as being free of diseases and species that could be a problem in your country.

You should also be able to find a company in your country that supplies these kinds of seeds. If you are unable to find one, try looking for other like minded gardeners who would like to trade seeds with you or check on places like eBay for small suppliers of these kinds of seeds.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/beans/harvesting-beans-when-do-you-pick-beans.htm

I have not heard of seapack before. But here is a directory and article of some common ground covers that might help you locate one that you like: https://urbanext.illinois.edu/groundcovers/directory/index.cfm, https://www.gardeningknowhow.com/special/shade/ground-covers-for-shade.htm You can try spreading bloodmeal among the newly planted lily of the valley. This sometimes will keep the squirrels away. Another method is to use chicken wire to fashion cages over and below the plants. The ones in the ground can stay there as the roots will easily grow through the holes and the ones above the ground can be removed once the plants are established and less of a taret to the squirrels.