European ‘home’ Royals
I’d love to see all Europeans have access to a Royal Embassy and a relevant Royal House depending on Civ.
Currently two European civs get a Royal Embassy wagon shipment via their Home City which allow them a historically-linked quirk of having access to Native units tied to the Civ in question. They are:
Germans - Prince Electors
Ships 1 Royal Embassy Wagon; choose any one German Royal House as an ally that will allow you to recruit and upgrade units at the Royal Embassy; allied units will now cost population in the Royal Embassy and Home City; removed cost for Royal Houses alliances; player can choose from Hanover, Habsburg, Oldenburg, Wettin, and Wittelsbach
France - Ancien Régime**
Ships 1 Royal Embassy Wagon; the House of Bourbon grants access to its royal units, upgrades, and two technologies (Bourbon Reforms and Royal Tax) in the Royal Embassy; Bourbon units now cost population slots when acquired from the Royal Embassy or the Home City
I would like to propose that all Europeans get access to a Royal Embassy Wagon shipment as a universal European quirk. Forts & Factories were the original (almost) exclusive Euro building they could ship, though this had expanded with the Post-Independent civs and very limited Consulate shipments.
Royal Houses ruled and were incredibly important (well, until you chop their heads off) so for Europeans to all have access to a Royal Embassy and Houses intrinsically linked to them seems justified. France and Germany being the ‘first’ two to have Royal Embassy wagons actually show us centralised Civs (French) getting a singular Royal House to focus on and non-centralised Civs (Germans) get a choice of a few Houses, which let’s them thematically narrow themselves to a particular German state.
With that in mind, Italy being a non-centralised Civ made of many states would get more Royal House options (that allow you to focus on a single particular City State with, like how German’s Prince-Elector currently works), in comparison to the centralised Britsh with their Hanover and potentially Tudor, Stuart (complete with Jacobite Rev!) and Nassau-Orange (shared also with the Dutch) Royal Houses.
On the gameplay-side it freshens up the standard Europeans by way of using Native units tied to their civ which is balanced by the investment of the shipment itself plus Native-benefitting techs/shipments. Whilst we have Civ packs covering a range of regional traits, it would be nice for the Europeans to get something intrinsically linked to them that they can access, especially as the Germans and French have this.
For the absolute minimum change, the existing Royal Houses can be used (Habsburgs will be super-common as they were so prominent), but maximum would be a few more new Royal Houses thrown in.