Yes. This would be very helpful to ensure that the joist working point will be over the supporting structure. You can contact an engineer with the joist manufacturer to help coordinate the bearing seat depth for your application. Table 5.4-3 in the SJI 100-2020 provides methods for calculating the joist bearing seat depth for this condition.

Table 5.4-3 in SJI specification ANSI SJI 100-2020 provides formulas that can be used to determine the joist bearing seat depth for this condition.

It may be possible depending on the required top chord angle size. If the joist is installed at a slope, there could be issues with the shallower seat depth. There is usually not a problem with this small a change, however, it is best to check with a joist manufacturer to make sure.

Specifying something and the manufacturer being able to meet that specification are two different things. Specifying a joist with a bearing seat depth less than 2½” can be done; however, joist manufacturers may not be able to design and manufacture a joist to meet that specification. If joists are at a slope, bearing seat depths greater than 2½” may be required.