Long rambling response below, if you are an experienced brewer it may be unnecessary, but someone else might gain something in reading it.
I haven't used any of the other yeasts you mentioned except 71B, so I will not make a recommendation. I use K1V-1116 for all my meads. There are probably better choices, but it works for me.
Your mead will end up about 12% ABV. With the ratios you have chosen, your cyser will be more apple than raspberry. I think that is good in a cyser.
I usually add the raspberries in secondary, or late in primary, but you can do them from the start if you prefer. Any of these choices will work. Either way, I suggest adding them (thawed) in a bag for easier removal and racking. Remove the berries when they look depleted. Remember to punch them down regularly so they do not mold floating on top.
I would recommend using a nutrient protocol of some sort. For this brew, I would add 1/4 of the nutrients when I saw evidence of fermentation (usually about 12 hours) and then 1/4 each 24 hours afterwards (24, 48, 72). These are not set in stone, do what works for you. DAP, Fermaid-K, or Fermaid-O would all be fine. I don't know what you have readily available in Dublin, any brewing nutrient (or boiled bread yeast) is probably better than none.
Since you have some nutrients in the cider itself, you can consider reducing the nutrients added, perhaps by half.
When your 71B stalled, were you using nutrients?
If you sanitize your equipment, properly rehydrate the yeast before adding to the must, aerate the must, and use nutrients added in a staggered protocol, you will almost certainly end up with a worthwhile mead.
Oh, and use a hydrometer!