OoC:
Perhaps part of the Trade Venture action could be modified along the following lines (or along lines similar to those, which follow)? . . .
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Difficulty: DDC 20 (+1 per non-trade-holding GB invested).
You must designate a province of origin, which you control or in which you control a non-source holding, for the Trade Venture. You must also decide how many GBs you are investing. You may invest a maximum number of GB equal to the average (rounding fractions up) of your trade holding levels and the total number of trade holding slots in the province of origin. However, each GB invested beyond the number of your trade holding levels increases the DDC by 1.
Example: Diirk Watershold controls a trade holding (5) in Calrie, a province with 7 trade holding slots. Therefore, at most, he could invest 6 ({5 + 7}/2) GB on a Trade Venture from that origin. Were he to invest 6 GB, the DDC would be 21; were he to invest 5 GB (or less), the DDC would be 20.
Example: Tasaenae Swordwraith controls no trade in Calrie, a province with 7 trade holding slots, but does control the province (as well as other non-source holding levels therein). Therefore, at most, she could invest 4 ({0 + 7}/2, rounded up) GB on a Trade Venture from that origin. The DDC of such an action would range from 21 to 24, depending on the number of GB invested.
Modifiers: Court; Stability; Advantage [Trade] – Use the advantage modifier in the province of origin; Special – Based on the action description, the DM may assign additional modifiers to reflect special dangers, hindrances, or circumstances.
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. . . Comments?