Two risks on the critical path...
o Connection
---- failure can cause local-heating or MCB/RCD trip
---- failure on a ring is 1) not obvious & 2) can result in 2.5T&E carrying 32A
o Insulation
---- failure can cause local-heating or MCB/RCD trip
---- failure can cause a N to E link, triping RCD & non-isolatable by MCB

Soldering involves both soldering & insulating tape risk.
o Tape seems to unwind -- not convinced about decadal cold-flow
o Soldering requires speed -- PVC insulation *continuous* rating of 60oC

Crimping involves single ratchet tool risk (insulating crimps proven).
o Crimping practice -- pull-apart test & inspect insulation

Surprised there isn't a simple kit...
o Simple barrel crimps tightly matched to solid core o.d. intervals
o Micro LNE-divided housing + bit of pourable epoxy, velcro for the cat

You can get heatshrink-insulating-crimps re extra mechanical strength.
Do not consider using cheap-n-cheesy stamped-bar crimp tools.
--
Dorothy Bradbury