Note: I had an unintended direct conflict in step 4. tx_HS needs to be evicted indirectly as a child of tx_LL. As I described it above, tx_LM would be a direct conflict with tx_HS and therefore would need to beat the individual feerate of tx_HS. It can be easily fixed by introducing a third confirmed input c3 that is spent in addition by tx_RBFr and by tx_LM instead of c2.
tx_HSneeds to be evicted indirectly as a child oftx_LL. As I described it above,tx_LMwould be a direct conflict withtx_HSand therefore would need to beat the individual feerate oftx_HS. It can be easily fixed by introducing a third confirmed inputc3that is spent in addition bytx_RBFrand bytx_LMinstead ofc2.