Strong rootstock will assure a rapid growth, resulting eventually in a quicker maturation.
So that's not certain Ilya.
Example:
A pear scion grafting on pear seedling takes longer than the same pear tree on quince tree.
To have fruit faster it is well known that it is necessary to use PG dwarfing is coming from cuttings.
Also you leave a seedling and you want to make fruit faster.
1) So I would use an adult tree to graft my scions ( because mature ) .
2) Or mature Poncirus cuttings.
If you use a vigorous PG from seedling I think you'll wait a long time and it's pretty normal because the Scion is not mature and the PG also is not old enough to give fruit.
So use to make fruit faster
Poncirus cuttings or other citrus
especially flying dragon cuttings.
However it will not be vigorous according to the choice of citrus.
The best is a vigorous citrus cutting (
no seedling ) if you want it to grow fast is giving fruit fast
However do not forget the cultivation method using the branch in ( arcure )
Bending a branch too vigorous, the movement of the SAP is slowed down, and it is forced to give fruit earlier and to take less strongly into sterile shoots. This operation is applicable to all fruit trees.
https://www.wikizero.com/fr/Arcure