According to the MUL, the Spirit Walker would be available to Clan Goliath Scorpion through to the Clan Invasion Era, but not thereafter. (Apparently, the last one known to exist outside of the Homeworlds was in Clan Wolf, and it seems to have been lost by the onset of the IlClan Era.)
The Scorpions do still have access to the -6b variant of the Black Knight proper, as of June 3152. Although, since it's not an OmniMech, other transport options would be required for a would-be attendant Point of battle armour.
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To make things even more awkward/interesting:
What if the 'Mech, in addition to the limitations noted above, had to either have an active probe installed as standard, or was able to have one installed without too much trouble?
Well, I suppose an OmniMech would have the advantage there, since they could simply use available pod space to install one, if required to do so.
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And on a less orthodox note: is there a way for a 'Mech - or a suit of battle armour - to approximate the use of the zulkari?
As in, for it to carry two short blades, which the 'Mech (or suit) could draw and/or sheath if required?
If so, where on the 'Mech (or suit) could - or perhaps must - they be stored when not in use?
And in terms of the actual blades themselves, would the Scorpions have access to vibroblade technology, or would such blades have to be "standard" bladed weapons?
Of course, most Clan MechWarriors are not keen on "augmented" physical combat - though Elemental warriors are no strangers to the concept. But on the off chance the Seeker is a bit too enthusiastic about being able to try an oversized Dance of the Scars, can it in fact be done?