For "non-Clan" Inner Sphere and near Periphery realms, perhaps certain component elements of Iron Womb technology would be useful for families with the means of acquiring them, in terms of further ensuring (or in some cases enabling) lines of succession.
The concept of sourcing genetic material from a "genemother" and "genefather" could be used as a form of IVF for some couples, and/or as a means of surrogacy for others, without necessarily creating "Trueborn" heirs directly.
Depending on the expense and expertise involved in acquiring and operating this technology for non-Clan states, it might not necessarily be something offered to any but the wealthiest of families, even on worlds such as Terra.
Indeed, this is something which more "integrationist" Clans, such as the Ghost Bears, could take, in terms of gaining the support of their conquered elites. There are cases of Spheroid and Periphery warriors being given the opportunity to Trial for the right to establish their own Bloodnames; while this would no doubt be the optimal approach from the Clan's perspective, also making expanded IVF and surrogacy options available to their subject populace (or at least to those which can afford it, though some sort of Trial could perhaps be offered to less well-off subjects seeking access to such options) could be viewed as a means of further incentivizing compliance.